diff --git a/Gemfile b/Gemfile
index 0fd7535..030dd12 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,7 @@
 source 'https://rubygems.org'
 
+ruby '2.0.0'
+
 gem 'sinatra'
 gem 'sinatra-contrib'
 gem 'sinatra-asset-pipeline'