metasploit-framework/lib/metasploit/framework/rails_version_constraint.rb

# Records the Bundler-style dependency constraint for the version of Rails to be
# used with the Metasploit Framework and Metasploit Pro.
module Metasploit
  module Framework
    module RailsVersionConstraint

      # The Metasploit ecosystem is not yet ready for Rails 4.1:
      RAILS_VERSION =  '~> 4.2.6'
    end
  end
end