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Python buildpacks updated to uv 0.8.9

Change effective on 13 August 2025

We have updated the package managers used during the build of Python apps as follows:

uv updated from 0.8.5 to 0.8.9 (changelog)

We recently added support for uv. If you have not used the package manager uv before, we highly recommend giving it a try - it supports lockfiles, is extremely fast, and is actively maintained by a full-time team! Learn more in our blog post Heroku Adds Support for uv.

Heroku-22 and Heroku-24 stacks updated Changes to release retention and rollback