diff --git a/docs/Gemfile b/docs/Gemfile
index e0279f576..159e8dde8 100644
--- a/docs/Gemfile
+++ b/docs/Gemfile
@@ -2,4 +2,4 @@ source 'https://rubygems.org'
 gem 'github-pages', group: :jekyll_plugins
 gem 'jekyll-redirect-from', group: :jekyll_plugins
 gem 'jekyll-seo-tag'
-
+gem 'rouge', :github => 'rouge-ruby/rouge'