diff --git a/Gemfile b/Gemfile
index 6775454..a4a85d2 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", "3.8.6"
+gem "jekyll", "4.2.1"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 gem "minima", "~> 2.5"
diff --git a/Gemfile.lock b/Gemfile.lock
index 155348e..4d9b2a0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,48 +1,53 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (3.2.22.5)
-      i18n (~> 0.6, >= 0.6.4)
-      multi_json (~> 1.0)
+    activesupport (6.1.4.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+      zeitwerk (~> 2.3)
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.8)
+    concurrent-ruby (1.1.9)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
     eventmachine (1.2.7-x86-mingw32)
-    ffi (1.15.0)
-    ffi (1.15.0-x64-mingw32)
-    ffi (1.15.0-x86-mingw32)
+    ffi (1.15.4)
+    ffi (1.15.4-x64-mingw32)
+    ffi (1.15.4-x86-mingw32)
     forwardable-extended (2.6.0)
     gemoji (3.0.1)
     html-pipeline (2.14.0)
       activesupport (>= 2)
       nokogiri (>= 1.4)
     http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    i18n (1.8.10)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.6)
+    jekyll (4.2.1)
       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 (~> 1.14)
+      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-feed (0.15.1)
       jekyll (>= 3.7, < 5.0)
     jekyll-paginate (1.1.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
+    jekyll-sass-converter (2.1.0)
+      sassc (> 2.0.1, < 3.0)
     jekyll-seo-tag (2.7.1)
       jekyll (>= 3.8, < 5.0)
     jekyll-watch (2.2.1)
@@ -51,24 +56,27 @@ GEM
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (>= 3.0, < 5.0)
-    kramdown (1.17.0)
+    kramdown (2.3.1)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.5.1)
+    listen (3.7.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.3.6)
-    mini_portile2 (2.5.1)
+    mercenary (0.4.0)
+    mini_portile2 (2.6.1)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
-    multi_json (1.15.0)
-    nokogiri (1.11.4)
-      mini_portile2 (~> 2.5.0)
+    minitest (5.14.4)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    nokogiri (1.11.4-x64-mingw32)
+    nokogiri (1.12.5-x64-mingw32)
       racc (~> 1.4)
-    nokogiri (1.11.4-x86-mingw32)
+    nokogiri (1.12.5-x86-mingw32)
       racc (~> 1.4)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
@@ -77,17 +85,21 @@ GEM
     rb-fsevent (0.11.0)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rouge (3.26.0)
+    rexml (3.2.5)
+    rouge (3.26.1)
     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)
+    sassc (2.4.0-x64-mingw32)
+      ffi (~> 1.9)
+    terminal-table (2.0.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
     tzinfo (2.0.0)
       concurrent-ruby (~> 1.0)
     tzinfo-data (1.2018.5)
       tzinfo (>= 1.0.0)
+    unicode-display_width (1.8.0)
+    zeitwerk (2.4.2)
 
 PLATFORMS
   ruby
@@ -95,7 +107,7 @@ PLATFORMS
   x86-mingw32
 
 DEPENDENCIES
-  jekyll (= 3.8.6)
+  jekyll (= 4.2.1)
   jekyll-feed (~> 0.15.1)
   jekyll-paginate
   jekyll-seo-tag (~> 2.7.1)