cf.Gemfile.lock

GIT
  remote: https://github.com/cloudfoundry/buildpack-packager
  revision: e74c4f16e8fb8b92d9de4d447af9d529e2f8af22
  tag: v2.3.19
  specs:
    buildpack-packager (2.3.19)
      activesupport (~> 4.1)
      kwalify (~> 0)
      semantic
      terminal-table (~> 1.4)

GEM
  remote: https://rubygems.org/
  specs:
    activesupport (4.2.11)
      i18n (~> 0.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    concurrent-ruby (1.1.4)
    i18n (0.9.5)
      concurrent-ruby (~> 1.0)
    kwalify (0.7.2)
    minitest (5.11.3)
    semantic (1.6.1)
    terminal-table (1.8.0)
      unicode-display_width (~> 1.1, >= 1.1.1)
    thread_safe (0.3.6)
    tzinfo (1.2.5)
      thread_safe (~> 0.1)
    unicode-display_width (1.4.1)

PLATFORMS
  ruby

DEPENDENCIES
  buildpack-packager!

RUBY VERSION
   ruby 2.3.1p112

BUNDLED WITH
   1.17.3