diff --git a/Gemfile b/Gemfile
index d3dd84695..eb0e94300 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,7 @@
 source 'http://rubygems.org'
 
 gem 'bundler', '> 1.1.0'
+ruby '1.9.3' if ENV['HEROKU']
 
 gem 'rails', '3.2.2'