diff --git a/Gemfile b/Gemfile
index 04c8f9c02dc..c58455961e1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,3 +8,4 @@ gem 'compass-colors'
 gem 'rdiscount'
 gem 'fssm'
 gem 'serve'
+gem 'mongrel'