Change effective on 22 November 2017
New Python applications pushed to Heroku will use the python-3.6.3 runtime by default (instead of python-3.6.2).
Existing applications will not be affected by this change.
Heroku Update
Starting November 28th, 2022, free Heroku Dynos, free Heroku Postgres, and free Heroku Data for Redis® will no longer be available.
If you have apps using any of these resources, you must upgrade to paid plans by this date to ensure your apps continue to run and to retain your data. For students, we will announce a new program by the end of September.