diff --git a/Gemfile b/Gemfile
index 0012c3129..8d6974733 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,4 +3,7 @@ source 'https://rubygems.org'
 
 gem "rake"
 gem "path"
+gem "rdoc"
 gem "json", "2.2.0"
+gem "rack"
+