diff --git a/.gitignore b/.gitignore
index 28eb6d32a30..6384f76a26c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,6 +6,7 @@
 public
 source/_stash
 source/stylesheets/screen.css
+source/.jekyll-cache/
 vendor
 node_modules
 source/.jekyll-metadata
diff --git a/Gemfile b/Gemfile
index b09f53b62f0..5575c63b347 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,8 +3,8 @@ source "https://rubygems.org"
 ruby "> 2.5.0"
 
 group :development do
-  gem 'rake', '12.3.2'
-  gem 'jekyll', '3.8.6'
+  gem 'rake', '12.3.3'
+  gem 'jekyll', '4.0.0'
   gem 'compass', '1.0.3'
   gem 'sass-globbing', '1.1.5'
   gem 'stringex', '2.8.5'
@@ -18,5 +18,5 @@ group :jekyll_plugins do
   gem 'jekyll-commonmark-ghpages', '0.1.6'
 end
 
-gem 'sinatra', '2.0.5'
+gem 'sinatra', '2.0.6'
 gem 'nokogiri', '1.10.3'
diff --git a/Gemfile.lock b/Gemfile.lock
index f125a245016..addf41e886c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,21 +27,23 @@ GEM
     ffi (1.11.1)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.9.5)
+    i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.6)
+    jekyll (4.0.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
-      jekyll-sass-converter (~> 1.0)
+      i18n (>= 0.9.5, < 2)
+      jekyll-sass-converter (~> 2.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 1.14)
+      kramdown (~> 2.1)
+      kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 4)
+      rouge (~> 3.0)
       safe_yaml (~> 1.0)
+      terminal-table (~> 1.8)
     jekyll-commonmark (1.3.1)
       commonmarker (~> 0.14)
       jekyll (>= 3.7, < 5.0)
@@ -52,15 +54,17 @@ GEM
     jekyll-paginate (1.1.0)
     jekyll-redirect-from (0.15.0)
       jekyll (>= 3.3, < 5.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
+    jekyll-sass-converter (2.0.0)
+      sassc (> 2.0.1, < 3.0)
     jekyll-sitemap (1.3.1)
       jekyll (>= 3.7, < 5.0)
     jekyll-time-to-read (0.1.2)
       jekyll
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (1.17.0)
+    kramdown (2.1.0)
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     liquid (4.0.3)
     listen (3.1.5)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -76,13 +80,13 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (3.1.1)
     rack (2.0.7)
-    rack-protection (2.0.5)
+    rack-protection (2.0.6)
       rack
-    rake (12.3.2)
+    rake (12.3.3)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
-    rouge (3.6.0)
+    rouge (3.9.0)
     ruby-enum (0.7.2)
       i18n
     ruby_dep (1.5.0)
@@ -90,29 +94,34 @@ GEM
     sass (3.4.25)
     sass-globbing (1.1.5)
       sass (>= 3.1)
-    sinatra (2.0.5)
+    sassc (2.1.0)
+      ffi (~> 1.9)
+    sinatra (2.0.6)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.5)
+      rack-protection (= 2.0.6)
       tilt (~> 2.0)
     stringex (2.8.5)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
     tilt (2.0.9)
+    unicode-display_width (1.6.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   compass (= 1.0.3)
-  jekyll (= 3.8.6)
+  jekyll (= 4.0.0)
   jekyll-commonmark-ghpages (= 0.1.6)
   jekyll-paginate (= 1.1.0)
   jekyll-redirect-from (= 0.15.0)
   jekyll-sitemap (= 1.3.1)
   jekyll-time-to-read (= 0.1.2)
   nokogiri (= 1.10.3)
-  rake (= 12.3.2)
+  rake (= 12.3.3)
   sass-globbing (= 1.1.5)
-  sinatra (= 2.0.5)
+  sinatra (= 2.0.6)
   stringex (= 2.8.5)
 
 RUBY VERSION