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PyPy v5.6.0 & PyPy3 v5.5.0 Available
Change effective on 17 December 2016
Heroku now unofficially supports new PyPy versions. You can specify a version with a runtime.txt file:
pypy-5.6.0pypy3-5.5.0
PyPy is a fantastic Python runtime, and can vastly increase the speed of many Python applications. However, it is not without its own quirks. You are encouraged to use PyPy only if you understand PyPy.