diff --git a/gemfiles/mongoid2.gemfile b/gemfiles/mongoid2.gemfile
index 4f6117843b..6e5997eb43 100644
--- a/gemfiles/mongoid2.gemfile
+++ b/gemfiles/mongoid2.gemfile
@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'mongoid', '~> 2.5'
+gem 'rails',   '~> 3.1'
 gem 'i18n',    '~> 0.6.9'
 
 platforms :jruby do
diff --git a/gemfiles/mongoid3.gemfile b/gemfiles/mongoid3.gemfile
index 894ddf551d..5c2953044a 100644
--- a/gemfiles/mongoid3.gemfile
+++ b/gemfiles/mongoid3.gemfile
@@ -1,6 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'mongoid', '~> 3.1'
+gem 'rails',   '~> 3.2'
 gem 'i18n',    '~> 0.6.9'
 
 platforms :jruby do