New Python Runtimes Available, Python 3.6.7 now Default

Change effective on 15 November 2018

The following Python runtimes are now available on all Heroku stacks:

Python 3.7.1 Python 3.6.7 Python 3.5.6 Python 3.4.9


The default runtime has been updated to Python 3.6.7. For more information, check out Heroku Python Support