diff --git a/Gemfile b/Gemfile
index f1bb84b..deec7b3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,5 +22,6 @@ gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
 # do not have a Java counterpart.
 gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
 
-gem "jekyll"
+gem "jekyll" 
+gem "jekyll-commonmark-ghpages"