diff --git a/Gemfile b/Gemfile
index a0b87e6bb8..26b5aee372 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 gem 'jekyll-redirect-from'
 gem 'jekyll-scalafiddle'
 gem 'html-proofer'
+gem 'kramdown-parser-gfm'
 # gem 'html-proofer' # link-checking: bundle exec htmlproofer ./_site/ --only-4xx --empty-alt-ignore --allow-hash-href
 
 # group :jekyll_plugins do
diff --git a/Gemfile.lock b/Gemfile.lock
index b01d106dff..1db7590360 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,14 +4,14 @@ GEM
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.7)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     ethon (0.12.0)
       ffi (>= 1.3.0)
     eventmachine (1.2.7)
-    ffi (1.12.2)
+    ffi (1.13.1)
     forwardable-extended (2.6.0)
     html-proofer (3.15.3)
       addressable (~> 2.3)
@@ -24,14 +24,14 @@ GEM
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.6)
+    jekyll (3.9.0)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
       i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
       jekyll-watch (~> 2.0)
-      kramdown (~> 1.14)
+      kramdown (>= 1.17, < 3)
       liquid (~> 4.0)
       mercenary (~> 0.3.3)
       pathutil (~> 0.9)
@@ -45,35 +45,37 @@ GEM
       jekyll (~> 3.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    kramdown (1.17.0)
+    kramdown (2.3.0)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
+    listen (3.2.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     mini_portile2 (2.4.0)
-    nokogiri (1.10.9)
+    nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     nokogumbo (2.0.2)
       nokogiri (~> 1.8, >= 1.8.4)
-    parallel (1.19.1)
+    parallel (1.19.2)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.4)
+    public_suffix (4.0.5)
     rainbow (3.0.0)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rouge (3.9.0)
-    ruby_dep (1.5.0)
+    rexml (3.2.4)
+    rouge (3.22.0)
     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)
-    typhoeus (1.3.1)
+    typhoeus (1.4.0)
       ethon (>= 0.9.0)
     yell (2.2.2)
 
@@ -84,6 +86,7 @@ DEPENDENCIES
   html-proofer
   jekyll-redirect-from
   jekyll-scalafiddle
+  kramdown-parser-gfm
 
 BUNDLED WITH
-   1.16.2
+   1.17.2