Heroku CI Automatic Dyno Type Choice

Change effective on 19 May 2021

Previously, Heroku CI would use performance-m dynos if a size wasn’t specified in app.json. We’ve updated Heroku CI so that for customers that don’t have access to performance-tier dynos, 2X dynos will be used instead.

See the Heroku CI Dev Center article for details on how to configure dyno type for test runs.