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Python 3.6.3 Default for Python Applications

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.yml build manifest is now available (developer preview)Heroku Postgres credential permissions can be managed in data.heroku.com