Python 3.13.9 is now available
Change effective on 15 October 2025
Python 3.13.9 is now available for use by Python apps on Heroku.
In addition, we have updated the Python 3.13 major version alias in our buildpacks so that it resolves to Python 3.13.9 instead of 3.13.8.
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.
See Specifying a Python Version for details on how to configure the Python version for your app.
Heroku’s buildpacks are open source. To subscribe to Python buildpack release notifications or provide feedback, see these repositories on GitHub:
- Python classic buildpack (used by Cedar-generation apps)
- Python Cloud Native Buildpack (used by Fir-generation apps)