Python buildpacks updated to Poetry 2.2.1 and uv 0.8.20

Change effective on 23 September 2025

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

  • Poetry updated from 2.2.0 to 2.2.1 (changelog)
  • uv updated from 0.8.18 to 0.8.20 (changelog)

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.