## Compatibility

Circuit is compatible with the following versions of Ruby, Rack, and Rails components:

**Ruby** 1.8.7 and 1.9
*Ruby 1.8.7 support will be removed when Rails 4 support is added*

**Rack** 1.3 and 1.4

**Rails** 3.1 and 3.2  
*ActiveSupport and ActiveModel are the only requirements from Rails*

**Mongoid** 2.4+
*MongoDB/Mongoid is not required*