Gemfile in mutations-0.6.0 vs Gemfile in mutations-0.7.0

@@ -1,8 +1,14 @@
 source 'http://rubygems.org'
 gemspec
 
 gem 'activesupport'
 
+platforms :rbx do
+  gem 'rubysl', '~> 2.0'
+  gem 'psych'
+  gem 'rubinius-developer_tools'
+end
+
 group :test do
   gem 'minitest', '~> 4.0'
 end
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