Python 3.14 is now available

Change effective on 09 October 2025

Python 3.14.0 is now available for use by Python apps on Heroku.

See What’s New In Python 3.14 to learn more about the new major version.

See Specifying a Python Version for details on how to configure the Python version for your app.

We strongly recommend that you use a major version alias when specifying a Python version for your app instead of pinning to an exact patch version, so that your app receives the latest Python security updates each time you build it. For example, use 3.14 in your .python-version file instead of 3.14.0.