diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 12ce6e0..7e006a0 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -6,7 +6,7 @@ jobs:
     continue-on-error: ${{ matrix.allow-failures }}
     strategy:
       matrix:
-        ruby: ['3.0', '3.1', '3.2']
+        ruby: ['3.0', '3.1', '3.2', '3.3']
         allow-failures: [false]
         include:
           - ruby: head
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index e8f6a59..2bf2589 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2023-09-01 14:03:01 UTC using RuboCop version 1.56.2.
+# on 2023-12-28 18:26:46 UTC using RuboCop version 1.59.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbf7c23..96e8478 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### New Features
 
 * Add `ruby-3.2` to CI
+* Add `ruby-3.3` to CI
 
 ### Changes
 
diff --git a/Gemfile.lock b/Gemfile.lock
index b0c1db6..197a961 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -97,4 +97,4 @@ DEPENDENCIES
   yard (>= 0.9.20)
 
 BUNDLED WITH
-   2.4.19
+   2.5.3