Ruby applications now support use of Bundler 2.x

Change effective on 19 February 2019

The Ruby Buildpack now includes Bundler 2.0.1. Previously all Ruby applications used the same Bundler version, however with the release of Bundler 2 that is no longer possible. The Ruby buildpack will now inspect the contents of the Gemfile.lock and use a version of bundler based on the BUNDLED WITH declaration.

  • Applications specifying Bundler 2.x in their Gemfile.lock will receive bundler: 2.0.1
  • Applications specifying Bundler 1.x in their Gemfile.lock will receive bundler: 1.15.2
  • Applications with no BUNDLED WITH in their Gemfile.lock will default to bundler: 1.15.2