Mirror some version of gems with Gem::Version DSL Create a mini_gem file and add this to it : source :gemcutter gem 'rails', ['~> 1.2.0', '>= 3.0'] or source :gemcutter resource :path => '/your_path/mini_gem.yml' # /your_path/mini_gem.yml gem: - rails: - - '~> 1.2.0' - '>= 3.0' It will solve the dependencies for you so you don't have to write an exhaustive list of the gems you want to mirror