diff --git a/Gemfile b/Gemfile
index 23c1cff..09112cb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -44,3 +44,7 @@ end
 
 # Use debugger
 # gem 'debugger', group: [:development, :test]
+gem 'therubyracer', :platforms => :ruby
+gem 'execjs'
+
+