In Depth Read the manual for an in-depth discussion of all of the options available in the Gemfile and how to use them. Gemfile manual Gemfiles Gemfiles require at least one gem source, in the form of the URL for a RubyGems server. Generate a Gemfile with the default rubygems.org source by running bundle init. If you can, use https so your connection to the rubygems.org server will be verified wit