diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 746c70f0..e316efda 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.4.4
+          ruby-version: 2.7.5
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
       - name: Build
         run: bundle exec jekyll build
diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index b6f2f993..fc4bc66e 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -11,7 +11,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.4.4
+          ruby-version: 2.7.5
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
       - name: Build
         run: bundle exec jekyll build
diff --git a/Gemfile b/Gemfile
index 411271c3..264de9d0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,9 +1,10 @@
 source "https://rubygems.org"
-ruby '2.4.4'
+ruby '2.7.5'
 gem 'ruby_dep', '1.3.1'
-gem 'jekyll', '3.8.5'
+gem 'jekyll', '3.9.1'
 gem 'jekyll-paginate', '1.1.0'
 gem 'jekyll-assets', '2.1.2'
 gem 'sass', '3.4.20'
 gem 'execjs', '2.6.0'
 gem 'uglifier', '2.7.2'
+gem "kramdown-parser-gfm", "~> 1.1"
diff --git a/Gemfile.lock b/Gemfile.lock
index a6499aff..9185ccaf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,29 +4,29 @@ GEM
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.3)
-    em-websocket (0.5.1)
+    concurrent-ruby (1.1.9)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     eventmachine (1.2.7)
     eventmachine (1.2.7-x64-mingw32)
     execjs (2.6.0)
     fastimage (1.8.1)
       addressable (~> 2.3, >= 2.3.5)
-    ffi (1.9.25)
-    ffi (1.9.25-x64-mingw32)
+    ffi (1.15.5)
+    ffi (1.15.5-x64-mingw32)
     forwardable-extended (2.6.0)
-    http_parser.rb (0.6.0)
+    http_parser.rb (0.8.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.5)
+    jekyll (3.9.1)
       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)
@@ -41,33 +41,36 @@ GEM
     jekyll-paginate (1.1.0)
     jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
-    jekyll-watch (2.1.2)
+    jekyll-watch (2.2.1)
       listen (~> 3.0)
-    json (2.3.1)
-    kramdown (1.17.0)
-    liquid (4.0.1)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
+    json (2.6.1)
+    kramdown (2.3.1)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    liquid (4.0.3)
+    listen (3.7.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
     rack (2.2.3)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    rouge (3.3.0)
+    rb-fsevent (0.11.1)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    rexml (3.2.5)
+    rouge (3.28.0)
     ruby_dep (1.3.1)
-    safe_yaml (1.0.4)
+    safe_yaml (1.0.5)
     sass (3.4.20)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-helpers (1.2.1)
+    sprockets-helpers (1.4.0)
       sprockets (>= 2.2)
-    tilt (2.0.9)
+    tilt (2.0.10)
     uglifier (2.7.2)
       execjs (>= 0.3.0)
       json (>= 1.8.0)
@@ -78,15 +81,16 @@ PLATFORMS
 
 DEPENDENCIES
   execjs (= 2.6.0)
-  jekyll (= 3.8.5)
+  jekyll (= 3.9.1)
   jekyll-assets (= 2.1.2)
   jekyll-paginate (= 1.1.0)
+  kramdown-parser-gfm (~> 1.1)
   ruby_dep (= 1.3.1)
   sass (= 3.4.20)
   uglifier (= 2.7.2)
 
 RUBY VERSION
-   ruby 2.4.4p296
+   ruby 2.7.5p203
 
 BUNDLED WITH
-   2.0.1
+   2.3.7
diff --git a/README.md b/README.md
index e4f4c2bb..3a286116 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ we will need to set up some Ruby tooling.
 First, install RVM (Ruby Version Manager): https://rvm.io/rvm/install
 Then run the following commands:
 ```bash
-$ rvm use 2.4.4 --install
+$ rvm use 2.7.5 --install
 
 # Set up Bundler, a Ruby package manager
 # It downloads dependencies specified in a Gemfile