diff --git a/01-rstudio-intro.html b/01-rstudio-intro.html
index 01a99a783..377a89652 100644
--- a/01-rstudio-intro.html
+++ b/01-rstudio-intro.html
@@ -1440,7 +1440,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/01-rstudio-intro.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/02-project-intro.html b/02-project-intro.html
index 0ce3f4141..e9385b4d6 100644
--- a/02-project-intro.html
+++ b/02-project-intro.html
@@ -618,7 +618,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By running these commands in the shell:</p>
 <div class="codewrapper sourceCode" id="cb1">
@@ -812,7 +812,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/02-project-intro.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/03-seeking-help.html b/03-seeking-help.html
index 2215b6e71..368959b44 100644
--- a/03-seeking-help.html
+++ b/03-seeking-help.html
@@ -643,7 +643,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -673,7 +673,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -782,7 +782,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -870,7 +870,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/03-seeking-help.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/04-data-structures-part1.html b/04-data-structures-part1.html
index d36b393e1..9702ab043 100644
--- a/04-data-structures-part1.html
+++ b/04-data-structures-part1.html
@@ -2386,7 +2386,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/04-data-structures-part1.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/05-data-structures-part2.html b/05-data-structures-part2.html
index 0dd829d01..30454e5c9 100644
--- a/05-data-structures-part2.html
+++ b/05-data-structures-part2.html
@@ -696,7 +696,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -974,7 +974,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1033,7 +1033,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1081,7 +1081,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1177,7 +1177,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/05-data-structures-part2.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/06-data-subsetting.html b/06-data-subsetting.html
index 65a782ea5..936ae5cec 100644
--- a/06-data-subsetting.html
+++ b/06-data-subsetting.html
@@ -1947,7 +1947,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/06-data-subsetting.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/07-control-flow.html b/07-control-flow.html
index 5e45de157..0eadddc10 100644
--- a/07-control-flow.html
+++ b/07-control-flow.html
@@ -558,7 +558,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>We will first see a solution to Challenge 1 which does not use the
 <code>any()</code> function. We first obtain a logical vector describing
@@ -895,7 +895,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>We can check whether the two vectors are identical using the
 <code>all()</code> function:</p>
@@ -980,7 +980,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><strong>Step 1</strong>: We want to make sure we can extract all the
 unique values of the continent vector</p>
@@ -1059,7 +1059,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We modify our solution to Challenge 3 by now adding two thresholds,
 <code>lowerThreshold</code> and <code>upperThreshold</code> and
@@ -1094,7 +1094,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>We will use the <code>grep()</code> command that was introduced in
 the <a href="https://swcarpentry.github.io/shell-novice/07-find.html" class="external-link">Unix
@@ -1224,7 +1224,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/07-control-flow.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/08-plot-ggplot2.html b/08-plot-ggplot2.html
index 9da484e1a..d04935558 100644
--- a/08-plot-ggplot2.html
+++ b/08-plot-ggplot2.html
@@ -541,7 +541,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -580,7 +580,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -688,7 +688,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -804,7 +804,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -847,7 +847,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -986,7 +986,7 @@ <h4 class="accordion-header" id="headingSolution6">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -1080,7 +1080,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/08-plot-ggplot2.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/09-vectorization.html b/09-vectorization.html
index a2e728f4b..ea62281e6 100644
--- a/09-vectorization.html
+++ b/09-vectorization.html
@@ -513,7 +513,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p><code>gapminder</code> データセットの <code>pop</code>
 列でこれに挑戦してみましょう。</p>
@@ -563,7 +563,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>チャレンジの解答
 100万人単位の人口を年ごとにプロットして、作図方法を復習しましょう。</p>
@@ -738,7 +738,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>以下のリストがあるとします：</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -815,7 +815,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ４
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>以下の分数の数列の総和が知りたいとします: ~~~ x:</p>
 <div class="codewrapper sourceCode" id="cb34">
@@ -1022,7 +1022,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/09-vectorization.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/10-functions.html b/10-functions.html
index e1d7b4f97..8292f1d44 100644
--- a/10-functions.html
+++ b/10-functions.html
@@ -550,7 +550,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
 temperature in Kelvin and returns that temperature in Celsius</p>
@@ -604,7 +604,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -726,7 +726,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>チャレンジ３の解答 明示的に <code>stopifnot()</code>
 を呼ぶことで先述の関数の定義を拡張しましょう。
@@ -943,7 +943,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb29">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1001,7 +1001,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -1153,7 +1153,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/10-functions.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/11-writing-data.html b/11-writing-data.html
index 3a3eddf6d..a35a81626 100644
--- a/11-writing-data.html
+++ b/11-writing-data.html
@@ -686,7 +686,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/11-writing-data.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/12-dplyr.html b/12-dplyr.html
index c5867d494..a72eef121 100644
--- a/12-dplyr.html
+++ b/12-dplyr.html
@@ -1246,7 +1246,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/12-dplyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/13-tidyr.html b/13-tidyr.html
index b0464e8fc..07190deae 100644
--- a/13-tidyr.html
+++ b/13-tidyr.html
@@ -510,7 +510,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>チャレンジ１の解答 元々の gapminder data.frame は、中間の形式です。
 複数の観測変数（<code>pop</code>,<code>lifeExp</code>,<code>gdpPercap</code>）があるため、
@@ -704,7 +704,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1001,7 +1001,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb37">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1174,7 +1174,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/13-tidyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/14-knitr-markdown.html b/14-knitr-markdown.html
index 7b9806289..0558a981d 100644
--- a/14-knitr-markdown.html
+++ b/14-knitr-markdown.html
@@ -568,7 +568,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -642,7 +642,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <pre>``{r load-ggplot2}
 library("ggplot2")
@@ -729,7 +729,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <pre>``{r echo = FALSE, fig.width = 3}
 plot(faithful)
@@ -778,7 +778,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = 4.</p>
 </div>
@@ -924,7 +924,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/14-knitr-markdown.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/15-wrap-up.html b/15-wrap-up.html
index 98925e7f3..adda755ed 100644
--- a/15-wrap-up.html
+++ b/15-wrap-up.html
@@ -590,7 +590,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/15-wrap-up.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/404.html b/404.html
index 95d413038..9e2b6c725 100644
--- a/404.html
+++ b/404.html
@@ -464,8 +464,8 @@ <h1>ページが見つかりません</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/404.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/404.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index d5c93c6f8..2a6bf0de1 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
@@ -464,7 +464,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/CODE_OF_CONDUCT.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index 0ad7264f6..dd920149c 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -510,7 +510,7 @@ <h1>Licenses</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/LICENSE.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/aio.html b/aio.html
index c5c3f6f44..5c2e14249 100644
--- a/aio.html
+++ b/aio.html
@@ -1727,7 +1727,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By running these commands in the shell:</p>
 <div class="codewrapper sourceCode" id="cb1">
@@ -2130,7 +2130,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -2160,7 +2160,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -2269,7 +2269,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -4573,7 +4573,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4859,7 +4859,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4919,7 +4919,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -4967,7 +4967,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul>
@@ -6707,7 +6707,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>We will first see a solution to Challenge 1 which does not use the
 <code>any()</code> function. We first obtain a logical vector describing
@@ -7046,7 +7046,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>We can check whether the two vectors are identical using the
 <code>all()</code> function:</p>
@@ -7131,7 +7131,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><strong>Step 1</strong>: We want to make sure we can extract all the
 unique values of the continent vector</p>
@@ -7212,7 +7212,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We modify our solution to Challenge 3 by now adding two thresholds,
 <code>lowerThreshold</code> and <code>upperThreshold</code> and
@@ -7247,7 +7247,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>We will use the <code>grep()</code> command that was introduced in
 the <a href="https://swcarpentry.github.io/shell-novice/07-find.html" class="external-link">Unix
@@ -7461,7 +7461,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -7501,7 +7501,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -7612,7 +7612,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -7731,7 +7731,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -7775,7 +7775,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -7923,7 +7923,7 @@ <h4 class="accordion-header" id="headingSolution6">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -8083,7 +8083,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p><code>gapminder</code> データセットの <code>pop</code>
 列でこれに挑戦してみましょう。</p>
@@ -8133,7 +8133,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>チャレンジの解答
 100万人単位の人口を年ごとにプロットして、作図方法を復習しましょう。</p>
@@ -8313,7 +8313,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>以下のリストがあるとします：</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -8398,7 +8398,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ４
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>以下の分数の数列の総和が知りたいとします: ~~~ x:</p>
 <div class="codewrapper sourceCode" id="cb34">
@@ -8699,7 +8699,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
 temperature in Kelvin and returns that temperature in Celsius</p>
@@ -8755,7 +8755,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -8880,7 +8880,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>チャレンジ３の解答 明示的に <code>stopifnot()</code>
 を呼ぶことで先述の関数の定義を拡張しましょう。
@@ -9101,7 +9101,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb29">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9159,7 +9159,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -10409,7 +10409,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>チャレンジ１の解答 元々の gapminder data.frame は、中間の形式です。
 複数の観測変数（<code>pop</code>,<code>lifeExp</code>,<code>gdpPercap</code>）があるため、
@@ -10605,7 +10605,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -10904,7 +10904,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb37">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -11197,7 +11197,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -11277,7 +11277,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <pre>``{r load-ggplot2}
 library("ggplot2")
@@ -11375,7 +11375,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <pre>``{r echo = FALSE, fig.width = 3}
 plot(faithful)
@@ -11426,7 +11426,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = 4.</p>
 </div>
@@ -11715,8 +11715,8 @@ <h3 class="callout-title">まとめ</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/aio.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/aio.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/discuss.html b/discuss.html
index 538c918a0..c99c65a83 100644
--- a/discuss.html
+++ b/discuss.html
@@ -461,7 +461,7 @@ <h1>議論１</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/discuss.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/images.html b/images.html
index a7304d65f..610887fbc 100644
--- a/images.html
+++ b/images.html
@@ -655,8 +655,8 @@ <h3 id="14-knitr-markdown-figure-3">図の3</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/images.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/images.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/index.html b/index.html
index 143e5e8a4..292a64793 100644
--- a/index.html
+++ b/index.html
@@ -476,8 +476,8 @@ <h3 class="callout-title">予備知識</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/index.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/index.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor-notes.html b/instructor-notes.html
index 9090b676e..801f41b32 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -662,8 +662,8 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor-notes.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor-notes.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/01-rstudio-intro.html b/instructor/01-rstudio-intro.html
index 0d8453849..da5cd763d 100644
--- a/instructor/01-rstudio-intro.html
+++ b/instructor/01-rstudio-intro.html
@@ -1463,7 +1463,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/01-rstudio-intro.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/02-project-intro.html b/instructor/02-project-intro.html
index ebbf7be04..34a7580a2 100644
--- a/instructor/02-project-intro.html
+++ b/instructor/02-project-intro.html
@@ -620,7 +620,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By running these commands in the shell:</p>
 <div class="codewrapper sourceCode" id="cb1">
@@ -814,7 +814,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/02-project-intro.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/03-seeking-help.html b/instructor/03-seeking-help.html
index 4d12f835e..122241250 100644
--- a/instructor/03-seeking-help.html
+++ b/instructor/03-seeking-help.html
@@ -645,7 +645,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -675,7 +675,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -784,7 +784,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -872,7 +872,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/03-seeking-help.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/04-data-structures-part1.html b/instructor/04-data-structures-part1.html
index 28a6e8493..2b305a0f3 100644
--- a/instructor/04-data-structures-part1.html
+++ b/instructor/04-data-structures-part1.html
@@ -2388,7 +2388,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/04-data-structures-part1.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/05-data-structures-part2.html b/instructor/05-data-structures-part2.html
index 732a1bd7d..280de82e6 100644
--- a/instructor/05-data-structures-part2.html
+++ b/instructor/05-data-structures-part2.html
@@ -698,7 +698,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -976,7 +976,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1035,7 +1035,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1083,7 +1083,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1179,7 +1179,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/05-data-structures-part2.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/06-data-subsetting.html b/instructor/06-data-subsetting.html
index 0fca9a703..c3938c4bb 100644
--- a/instructor/06-data-subsetting.html
+++ b/instructor/06-data-subsetting.html
@@ -1949,7 +1949,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/06-data-subsetting.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/07-control-flow.html b/instructor/07-control-flow.html
index 1b8d8c57b..cc573046b 100644
--- a/instructor/07-control-flow.html
+++ b/instructor/07-control-flow.html
@@ -560,7 +560,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>We will first see a solution to Challenge 1 which does not use the
 <code>any()</code> function. We first obtain a logical vector describing
@@ -897,7 +897,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>We can check whether the two vectors are identical using the
 <code>all()</code> function:</p>
@@ -982,7 +982,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><strong>Step 1</strong>: We want to make sure we can extract all the
 unique values of the continent vector</p>
@@ -1061,7 +1061,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We modify our solution to Challenge 3 by now adding two thresholds,
 <code>lowerThreshold</code> and <code>upperThreshold</code> and
@@ -1096,7 +1096,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>We will use the <code>grep()</code> command that was introduced in
 the <a href="https://swcarpentry.github.io/shell-novice/07-find.html" class="external-link">Unix
@@ -1226,7 +1226,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/07-control-flow.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/08-plot-ggplot2.html b/instructor/08-plot-ggplot2.html
index 2967d0e75..37b56d5ab 100644
--- a/instructor/08-plot-ggplot2.html
+++ b/instructor/08-plot-ggplot2.html
@@ -543,7 +543,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -582,7 +582,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -690,7 +690,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -806,7 +806,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -849,7 +849,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -988,7 +988,7 @@ <h4 class="accordion-header" id="headingSolution6">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -1082,7 +1082,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/08-plot-ggplot2.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/09-vectorization.html b/instructor/09-vectorization.html
index e1e870ad2..161f7ba82 100644
--- a/instructor/09-vectorization.html
+++ b/instructor/09-vectorization.html
@@ -515,7 +515,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p><code>gapminder</code> データセットの <code>pop</code>
 列でこれに挑戦してみましょう。</p>
@@ -565,7 +565,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>チャレンジの解答
 100万人単位の人口を年ごとにプロットして、作図方法を復習しましょう。</p>
@@ -740,7 +740,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>以下のリストがあるとします：</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -817,7 +817,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ４
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>以下の分数の数列の総和が知りたいとします: ~~~ x:</p>
 <div class="codewrapper sourceCode" id="cb34">
@@ -1024,7 +1024,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/09-vectorization.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/10-functions.html b/instructor/10-functions.html
index bc02f82a8..3e6617628 100644
--- a/instructor/10-functions.html
+++ b/instructor/10-functions.html
@@ -552,7 +552,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
 temperature in Kelvin and returns that temperature in Celsius</p>
@@ -606,7 +606,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -728,7 +728,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>チャレンジ３の解答 明示的に <code>stopifnot()</code>
 を呼ぶことで先述の関数の定義を拡張しましょう。
@@ -945,7 +945,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb29">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1003,7 +1003,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -1155,7 +1155,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/10-functions.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/11-writing-data.html b/instructor/11-writing-data.html
index 5cc1143e5..9205b34c5 100644
--- a/instructor/11-writing-data.html
+++ b/instructor/11-writing-data.html
@@ -688,7 +688,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/11-writing-data.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/12-dplyr.html b/instructor/12-dplyr.html
index 83d21eadc..af90b41b1 100644
--- a/instructor/12-dplyr.html
+++ b/instructor/12-dplyr.html
@@ -1248,7 +1248,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/12-dplyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/13-tidyr.html b/instructor/13-tidyr.html
index dbb0a69f7..e320f887b 100644
--- a/instructor/13-tidyr.html
+++ b/instructor/13-tidyr.html
@@ -512,7 +512,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>チャレンジ１の解答 元々の gapminder data.frame は、中間の形式です。
 複数の観測変数（<code>pop</code>,<code>lifeExp</code>,<code>gdpPercap</code>）があるため、
@@ -706,7 +706,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1003,7 +1003,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb37">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1176,7 +1176,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/13-tidyr.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/14-knitr-markdown.html b/instructor/14-knitr-markdown.html
index b88628258..766432e08 100644
--- a/instructor/14-knitr-markdown.html
+++ b/instructor/14-knitr-markdown.html
@@ -570,7 +570,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -644,7 +644,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <pre>``{r load-ggplot2}
 library("ggplot2")
@@ -731,7 +731,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <pre>``{r echo = FALSE, fig.width = 3}
 plot(faithful)
@@ -780,7 +780,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = 4.</p>
 </div>
@@ -926,7 +926,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/14-knitr-markdown.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/15-wrap-up.html b/instructor/15-wrap-up.html
index 8aaa4fd73..472a4690f 100644
--- a/instructor/15-wrap-up.html
+++ b/instructor/15-wrap-up.html
@@ -592,7 +592,7 @@ <h3 class="callout-title">まとめ</h3>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/15-wrap-up.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/404.html b/instructor/404.html
index e51a20d27..8f54a6b59 100644
--- a/instructor/404.html
+++ b/instructor/404.html
@@ -464,8 +464,8 @@ <h1>ページが見つかりません</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/404.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/404.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index 52e145ef3..9d5993517 100644
--- a/instructor/CODE_OF_CONDUCT.html
+++ b/instructor/CODE_OF_CONDUCT.html
@@ -466,7 +466,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/CODE_OF_CONDUCT.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 2a61515ef..94c475663 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
@@ -512,7 +512,7 @@ <h1>Licenses</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/LICENSE.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/aio.html b/instructor/aio.html
index 43a2699a5..5c4d71325 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -1752,7 +1752,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By running these commands in the shell:</p>
 <div class="codewrapper sourceCode" id="cb1">
@@ -2156,7 +2156,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -2186,7 +2186,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -2295,7 +2295,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -4601,7 +4601,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb28">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4887,7 +4887,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4947,7 +4947,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -4995,7 +4995,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul>
@@ -6737,7 +6737,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>We will first see a solution to Challenge 1 which does not use the
 <code>any()</code> function. We first obtain a logical vector describing
@@ -7076,7 +7076,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>We can check whether the two vectors are identical using the
 <code>all()</code> function:</p>
@@ -7161,7 +7161,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p><strong>Step 1</strong>: We want to make sure we can extract all the
 unique values of the continent vector</p>
@@ -7242,7 +7242,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>We modify our solution to Challenge 3 by now adding two thresholds,
 <code>lowerThreshold</code> and <code>upperThreshold</code> and
@@ -7277,7 +7277,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <p>We will use the <code>grep()</code> command that was introduced in
 the <a href="https://swcarpentry.github.io/shell-novice/07-find.html" class="external-link">Unix
@@ -7492,7 +7492,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -7532,7 +7532,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -7643,7 +7643,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -7762,7 +7762,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -7806,7 +7806,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -7954,7 +7954,7 @@ <h4 class="accordion-header" id="headingSolution6">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -8115,7 +8115,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p><code>gapminder</code> データセットの <code>pop</code>
 列でこれに挑戦してみましょう。</p>
@@ -8165,7 +8165,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>チャレンジの解答
 100万人単位の人口を年ごとにプロットして、作図方法を復習しましょう。</p>
@@ -8345,7 +8345,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>以下のリストがあるとします：</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -8430,7 +8430,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ４
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>以下の分数の数列の総和が知りたいとします: ~~~ x:</p>
 <div class="codewrapper sourceCode" id="cb34">
@@ -8732,7 +8732,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ８の解答 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Write a function called <code>kelvin_to_celsius</code> that takes a
 temperature in Kelvin and returns that temperature in Celsius</p>
@@ -8788,7 +8788,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Define the function to convert directly from Fahrenheit to Celsius,
 by reusing these two functions above</p>
@@ -8913,7 +8913,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>チャレンジ３の解答 明示的に <code>stopifnot()</code>
 を呼ぶことで先述の関数の定義を拡張しましょう。
@@ -9134,7 +9134,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb29">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9192,7 +9192,7 @@ <h4 class="accordion-header" id="headingSolution5">
   チャレンジ８の解答
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Write a function called <code>fence()</code> that takes two vectors
 as arguments, called <code>text</code> and <code>wrapper</code>, and
@@ -10445,7 +10445,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>チャレンジ１の解答 元々の gapminder data.frame は、中間の形式です。
 複数の観測変数（<code>pop</code>,<code>lifeExp</code>,<code>gdpPercap</code>）があるため、
@@ -10641,7 +10641,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb12">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -10940,7 +10940,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb37">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -11234,7 +11234,7 @@ <h4 class="accordion-header" id="headingSolution1">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>In RStudio, select File &gt; New file &gt; R Markdown…</p>
 <p>Delete the placeholder text and add the following:</p>
@@ -11314,7 +11314,7 @@ <h4 class="accordion-header" id="headingSolution2">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <pre>``{r load-ggplot2}
 library("ggplot2")
@@ -11412,7 +11412,7 @@ <h4 class="accordion-header" id="headingSolution3">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <pre>``{r echo = FALSE, fig.width = 3}
 plot(faithful)
@@ -11463,7 +11463,7 @@ <h4 class="accordion-header" id="headingSolution4">
   チャレンジ３の解答
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here’s some inline code to determine that 2 + 2 = 4.</p>
 </div>
@@ -11753,8 +11753,8 @@ <h3 class="callout-title">まとめ</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/aio.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/aio.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/discuss.html b/instructor/discuss.html
index 63a8b7800..c275af82d 100644
--- a/instructor/discuss.html
+++ b/instructor/discuss.html
@@ -463,7 +463,7 @@ <h1>議論１</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/discuss.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/images.html b/instructor/images.html
index 938dad3d0..e607109ac 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -657,8 +657,8 @@ <h3 id="14-knitr-markdown-figure-3">図の3</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/images.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/images.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/index.html b/instructor/index.html
index b0ad131c4..eb556580b 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -627,8 +627,8 @@ <h3 class="callout-title">予備知識</h3>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/index.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/index.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index aeb9bdec7..cb4d7d777 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -695,8 +695,8 @@ <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/instructor-notes.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/instructor-notes.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index b1c8b73e6..cdaeeaf73 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -634,8 +634,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/key-points.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/key-points.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/profiles.html b/instructor/profiles.html
index ff0e1bf44..e60c07b14 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -418,8 +418,8 @@ <h1>学習者プロフィール</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/instructor/profiles.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/profiles.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/instructor/reference.html b/instructor/reference.html
index 983468cd8..15cb6f35e 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -945,7 +945,7 @@ <h1>Reference</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/instructor/reference.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index 4dd404699..6ea9a1a19 100644
--- a/key-points.html
+++ b/key-points.html
@@ -632,8 +632,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://swcarpentry.github.io/r-novice-gapminder/key-points.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/key-points.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index 62363ce5d..07a75f1f1 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,4 +2,4 @@ pandoc: 3.1.11
 pkgdown: 2.1.1
 pkgdown_sha: ~
 articles: {}
-last_built: 2024-12-31T01:43Z
+last_built: 2025-01-07T01:45Z
diff --git a/profiles.html b/profiles.html
index d083bf36c..c91575b58 100644
--- a/profiles.html
+++ b/profiles.html
@@ -418,8 +418,8 @@ <h1>学習者プロフィール</h1>
   "url": "https://swcarpentry.github.io/r-novice-gapminder/profiles.html",
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/profiles.html",
   "dateCreated": "2015-04-18",
-  "dateModified": "2024-12-31",
-  "datePublished": "2024-12-31"
+  "dateModified": "2025-01-07",
+  "datePublished": "2025-01-07"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index 08840f0ea..543abb706 100644
--- a/reference.html
+++ b/reference.html
@@ -943,7 +943,7 @@ <h1>Reference</h1>
   "identifier": "https://swcarpentry.github.io/r-novice-gapminder/reference.html",
   "dateCreated": "2015-04-18",
   "dateModified": "2024-11-19",
-  "datePublished": "2024-12-31"
+  "datePublished": "2025-01-07"
 }
 
   </script><script>