diff --git a/.gitignore b/.gitignore
index bb836e13..ab6f392c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ font/.fontcustom-manifest.json
 assets/webfonts/ptio-font-preview.html
 vendor
 .bundle
+.jekyll-cache
diff --git a/Gemfile b/Gemfile
index ad86f80f..d7dc44c6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,7 +8,7 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 3.9"
+gem "jekyll", "~> 4.2"
 
 # Install jekyll-brotli gem (https://github.com/philnash/jekyll-brotli/)
 # If you have any plugins, put them here!
diff --git a/Gemfile.lock b/Gemfile.lock
index 2710b317..6170c7d5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,26 +13,28 @@ GEM
     ffi (1.14.2)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    i18n (1.8.7)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.0)
+    jekyll (4.2.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
-      jekyll-sass-converter (~> 1.0)
+      i18n (~> 1.0)
+      jekyll-sass-converter (~> 2.0)
       jekyll-watch (~> 2.0)
-      kramdown (>= 1.17, < 3)
+      kramdown (~> 2.3)
+      kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.3.3)
+      mercenary (~> 0.4.0)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 4)
+      rouge (~> 3.0)
       safe_yaml (~> 1.0)
+      terminal-table (~> 2.0)
     jekyll-brotli (2.2.1)
       brotli (~> 0.2.0)
       jekyll (>= 3.0, < 5.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
+    jekyll-sass-converter (2.1.0)
+      sassc (> 2.0.1, < 3.0)
     jekyll-sitemap (1.4.0)
       jekyll (>= 3.7, < 5.0)
     jekyll-watch (2.2.1)
@@ -45,7 +47,7 @@ GEM
     listen (3.4.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.3.6)
+    mercenary (0.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
@@ -55,18 +57,18 @@ GEM
     rexml (3.2.4)
     rouge (3.26.0)
     safe_yaml (1.0.5)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    terminal-table (2.0.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    unicode-display_width (1.7.0)
     webrick (1.7.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (~> 3.9)
+  jekyll (~> 4.2)
   jekyll-brotli (~> 2.2)
   jekyll-sitemap (~> 1.4)
   kramdown-parser-gfm (~> 1.1)