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Ruby apps with Bundler 1.x now receive version 1.17.3

Change effective on 24 September 2019

The Ruby Buildpack now includes Bundler 1.17.3. Applications specifying Bundler 1.x in their Gemfile.lock will now receive bundler: 1.17.3.

We’ve received reports that there is a bug with this version of Bundler and Ruby 2.6.0 and 2.6.1. If you’re using one of these versions please update your Ruby version to 2.6.3+. The issue looks related to this bug report but has a different failure mode. We are still investigating.

Default `MALLOC_ARENA_MAX=2` for new Ruby applications Cedar-14, Heroku-16 and Heroku-18 Stack Images Updated