diff --git a/Gemfile b/Gemfile
index d5bfd77..cb95c5d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,6 +3,7 @@ source :rubygems
 gemspec
 
 group :test do
+  gem 'johnson',      :platform => :ruby
   gem 'json'
   gem 'mustang',      :platform => :ruby
   gem 'therubyracer', :platform => :ruby