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.
Gemfile.lockwill receive bundler: 2.0.1
Gemfile.lockwill receive bundler: 1.15.2
BUNDLED WITHin their
Gemfile.lockwill default to bundler: 1.15.2