diff --git a/Gemfile b/Gemfile
index db2060306..bbd7382fd 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 source 'http://rubygems.org'
 
+ruby "2.2"
+
 gem 'rails', '4.2.5'
 gem 'rails-observers'
 gem 'activerecord-session_store'