diff --git a/package.json b/package.json
index 15dc3fbf..c7398c03 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "browserify": "^15.0.0",
+    "browserify": "^16.0.0",
     "chromedriver": "^2.38.3",
     "eslint-browserify": "^1.4.4",
     "eslint-config-yoast": "^3.0.0",
diff --git a/yarn.lock b/yarn.lock
index 0f9806b3..fb1a56f7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -364,26 +364,27 @@ browserify-zlib@~0.2.0:
   dependencies:
     pako "~1.0.5"
 
-browserify@^15.0.0:
-  version "15.2.0"
-  resolved "https://registry.yarnpkg.com/browserify/-/browserify-15.2.0.tgz#1e121ba1fa72cf9fd2d8df002f8674b68b45df89"
+browserify@^16.0.0:
+  version "16.5.1"
+  resolved "https://registry.yarnpkg.com/browserify/-/browserify-16.5.1.tgz#3c13c97436802930d5c3ae28658ddc33bfd37dc2"
+  integrity sha512-EQX0h59Pp+0GtSRb5rL6OTfrttlzv+uyaUVlK6GX3w11SQ0jKPKyjC/54RhPR2ib2KmfcELM06e8FxcI5XNU2A==
   dependencies:
     JSONStream "^1.0.3"
     assert "^1.4.0"
     browser-pack "^6.0.1"
     browser-resolve "^1.11.0"
     browserify-zlib "~0.2.0"
-    buffer "^5.0.2"
+    buffer "~5.2.1"
     cached-path-relative "^1.0.0"
-    concat-stream "~1.5.1"
+    concat-stream "^1.6.0"
     console-browserify "^1.1.0"
     constants-browserify "~1.0.0"
     crypto-browserify "^3.0.0"
     defined "^1.0.0"
     deps-sort "^2.0.0"
-    domain-browser "~1.1.0"
+    domain-browser "^1.2.0"
     duplexer2 "~0.1.2"
-    events "~1.1.0"
+    events "^2.0.0"
     glob "^7.1.0"
     has "^1.0.0"
     htmlescape "^1.1.0"
@@ -391,8 +392,8 @@ browserify@^15.0.0:
     inherits "~2.0.1"
     insert-module-globals "^7.0.0"
     labeled-stream-splicer "^2.0.0"
-    mkdirp "^0.5.0"
-    module-deps "^5.0.1"
+    mkdirp-classic "^0.5.2"
+    module-deps "^6.0.0"
     os-browserify "~0.3.0"
     parents "^1.0.1"
     path-browserify "~0.0.0"
@@ -405,16 +406,16 @@ browserify@^15.0.0:
     shasum "^1.0.0"
     shell-quote "^1.6.1"
     stream-browserify "^2.0.0"
-    stream-http "^2.0.0"
-    string_decoder "~1.0.0"
+    stream-http "^3.0.0"
+    string_decoder "^1.1.1"
     subarg "^1.0.0"
     syntax-error "^1.1.1"
     through2 "^2.0.0"
     timers-browserify "^1.0.1"
-    tty-browserify "~0.0.0"
+    tty-browserify "0.0.1"
     url "~0.11.0"
     util "~0.10.1"
-    vm-browserify "~0.0.1"
+    vm-browserify "^1.0.0"
     xtend "^4.0.0"
 
 browserify@^16.1.0:
@@ -485,6 +486,14 @@ buffer@^5.0.2:
     base64-js "^1.0.2"
     ieee754 "^1.1.4"
 
+buffer@~5.2.1:
+  version "5.2.1"
+  resolved "https://registry.yarnpkg.com/buffer/-/buffer-5.2.1.tgz#dd57fa0f109ac59c602479044dca7b8b3d0b71d6"
+  integrity sha512-c+Ko0loDaFfuPWiL02ls9Xd3GO3cPVmUobQ6t3rXNUk304u6hGq+8N/kFi+QEIKhzK3uwolVhLzszmfLmMLnqg==
+  dependencies:
+    base64-js "^1.0.2"
+    ieee754 "^1.1.4"
+
 builtin-modules@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
@@ -690,14 +699,6 @@ concat-stream@1.6.2, concat-stream@^1.4.6, concat-stream@^1.6.0, concat-stream@^
     readable-stream "^2.2.2"
     typedarray "^0.0.6"
 
-concat-stream@~1.5.1:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.5.2.tgz#708978624d856af41a5a741defdd261da752c266"
-  dependencies:
-    inherits "~2.0.1"
-    readable-stream "~2.0.0"
-    typedarray "~0.0.5"
-
 console-browserify@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/console-browserify/-/console-browserify-1.1.0.tgz#f0241c45730a9fc6323b206dbf38edc741d0bb10"
@@ -980,10 +981,6 @@ domain-browser@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/domain-browser/-/domain-browser-1.2.0.tgz#3d31f50191a6749dd1375a7f522e823d42e54eda"
 
-domain-browser@~1.1.0:
-  version "1.1.7"
-  resolved "https://registry.yarnpkg.com/domain-browser/-/domain-browser-1.1.7.tgz#867aa4b093faa05f1de08c06f4d7b21fdf8698bc"
-
 dotenv@7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-7.0.0.tgz#a2be3cd52736673206e8a85fb5210eea29628e7c"
@@ -1339,10 +1336,6 @@ events@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/events/-/events-2.1.0.tgz#2a9a1e18e6106e0e812aa9ebd4a819b3c29c0ba5"
 
-events@~1.1.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/events/-/events-1.1.1.tgz#9ebdb7635ad099c70dcc4c2a1f5004288e8bd924"
-
 evp_bytestokey@^1.0.0, evp_bytestokey@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/evp_bytestokey/-/evp_bytestokey-1.0.3.tgz#7fcbdb198dc71959432efe13842684e0525acb02"
@@ -1931,10 +1924,6 @@ indent-string@^2.1.0:
   dependencies:
     repeating "^2.0.0"
 
-indexof@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/indexof/-/indexof-0.0.1.tgz#82dc336d232b9062179d05ab3293a66059fd435d"
-
 inflight@^1.0.4:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
@@ -1954,6 +1943,11 @@ inherits@2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.1.tgz#b17d08d326b4423e568eff719f91b0b1cbdf69f1"
 
+inherits@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
+  integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
+
 ini@~1.3.0:
   version "1.3.5"
   resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
@@ -2714,6 +2708,11 @@ minizlib@^1.1.0:
   dependencies:
     minipass "^2.2.1"
 
+mkdirp-classic@^0.5.2:
+  version "0.5.3"
+  resolved "https://registry.yarnpkg.com/mkdirp-classic/-/mkdirp-classic-0.5.3.tgz#fa10c9115cc6d8865be221ba47ee9bed78601113"
+  integrity sha512-gKLcREMhtuZRwRAfqP3RFW+TK4JqApVBtOIftVgjuABpAtpxhPGaDcfvbhNvD0B8iD1oUr/txX35NjcaY6Ns/A==
+
 mkdirp@0.5.1, mkdirp@^0.5.0, mkdirp@^0.5.1, mkdirp@~0.5.1:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
@@ -2740,26 +2739,6 @@ mocha@^5.2.0:
     mkdirp "0.5.1"
     supports-color "5.4.0"
 
-module-deps@^5.0.1:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/module-deps/-/module-deps-5.0.1.tgz#3bc47c14b0a6d925aff2ec4a177b456a96ae0396"
-  dependencies:
-    JSONStream "^1.0.3"
-    browser-resolve "^1.7.0"
-    cached-path-relative "^1.0.0"
-    concat-stream "~1.6.0"
-    defined "^1.0.0"
-    detective "^5.0.2"
-    duplexer2 "^0.1.2"
-    inherits "^2.0.1"
-    parents "^1.0.0"
-    readable-stream "^2.0.2"
-    resolve "^1.1.3"
-    stream-combiner2 "^1.1.1"
-    subarg "^1.0.0"
-    through2 "^2.0.0"
-    xtend "^4.0.0"
-
 module-deps@^6.0.0:
   version "6.1.0"
   resolved "https://registry.yarnpkg.com/module-deps/-/module-deps-6.1.0.tgz#d1e1efc481c6886269f7112c52c3236188e16479"
@@ -3182,10 +3161,6 @@ pretty-ms@^2.1.0:
     parse-ms "^1.0.0"
     plur "^1.0.0"
 
-process-nextick-args@~1.0.6:
-  version "1.0.7"
-  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"
-
 process-nextick-args@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.0.tgz#a37d732f4271b4ab1ad070d35508e8290788ffaa"
@@ -3358,16 +3333,14 @@ readable-stream@^2.0.2, readable-stream@^2.0.6, readable-stream@^2.1.5, readable
     string_decoder "~1.1.1"
     util-deprecate "~1.0.1"
 
-readable-stream@~2.0.0:
-  version "2.0.6"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.0.6.tgz#8f90341e68a53ccc928788dacfcd11b36eb9b78e"
+readable-stream@^3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-3.6.0.tgz#337bbda3adc0706bd3e024426a286d4b4b2c9198"
+  integrity sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==
   dependencies:
-    core-util-is "~1.0.0"
-    inherits "~2.0.1"
-    isarray "~1.0.0"
-    process-nextick-args "~1.0.6"
-    string_decoder "~0.10.x"
-    util-deprecate "~1.0.1"
+    inherits "^2.0.3"
+    string_decoder "^1.1.1"
+    util-deprecate "^1.0.1"
 
 readdirp@^2.0.0:
   version "2.1.0"
@@ -3470,7 +3443,7 @@ resolve@1.1.7, resolve@~1.1.0:
   version "1.1.7"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
 
-resolve@^1.1.3, resolve@^1.1.4, resolve@^1.4.0:
+resolve@^1.1.4, resolve@^1.4.0:
   version "1.7.1"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.7.1.tgz#aadd656374fd298aee895bc026b8297418677fd3"
   dependencies:
@@ -3731,6 +3704,16 @@ stream-http@^2.0.0:
     to-arraybuffer "^1.0.0"
     xtend "^4.0.0"
 
+stream-http@^3.0.0:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/stream-http/-/stream-http-3.1.1.tgz#0370a8017cf8d050b9a8554afe608f043eaff564"
+  integrity sha512-S7OqaYu0EkFpgeGFb/NPOoPLxFko7TPqtEeFg5DXPB4v/KETHG0Ln6fRFrNezoelpaDKmycEmmZ81cC9DAwgYg==
+  dependencies:
+    builtin-status-codes "^3.0.0"
+    inherits "^2.0.4"
+    readable-stream "^3.6.0"
+    xtend "^4.0.2"
+
 stream-splicer@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/stream-splicer/-/stream-splicer-2.0.0.tgz#1b63be438a133e4b671cc1935197600175910d83"
@@ -3763,12 +3746,6 @@ string_decoder@~0.10.x:
   version "0.10.31"
   resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-0.10.31.tgz#62e203bc41766c6c28c9fc84301dab1c5310fa94"
 
-string_decoder@~1.0.0:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.0.3.tgz#0fc67d7c141825de94282dd536bec6b9bce860ab"
-  dependencies:
-    safe-buffer "~5.1.0"
-
 strip-ansi@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-2.0.1.tgz#df62c1aa94ed2f114e1d0f21fd1d50482b79a60e"
@@ -3929,7 +3906,7 @@ trim-newlines@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-1.0.0.tgz#5887966bb582a4503a41eb524f7d35011815a613"
 
-tty-browserify@0.0.1, tty-browserify@~0.0.0:
+tty-browserify@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/tty-browserify/-/tty-browserify-0.0.1.tgz#3f05251ee17904dfd0677546670db9651682b811"
 
@@ -3959,7 +3936,7 @@ typechecker@^4.3.0:
   dependencies:
     editions "^1.3.4"
 
-typedarray@^0.0.6, typedarray@~0.0.5:
+typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
@@ -4045,12 +4022,6 @@ vm-browserify@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/vm-browserify/-/vm-browserify-1.0.1.tgz#a15d7762c4c48fa6bf9f3309a21340f00ed23063"
 
-vm-browserify@~0.0.1:
-  version "0.0.4"
-  resolved "https://registry.yarnpkg.com/vm-browserify/-/vm-browserify-0.0.4.tgz#5d7ea45bbef9e4a6ff65f95438e0a87c357d5a73"
-  dependencies:
-    indexof "0.0.1"
-
 watchify@^3.9.0:
   version "3.11.0"
   resolved "https://registry.yarnpkg.com/watchify/-/watchify-3.11.0.tgz#03f1355c643955e7ab8dcbf399f624644221330f"
@@ -4117,6 +4088,11 @@ xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
 
+xtend@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"
+  integrity sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==
+
 yallist@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"