Python buildpacks updated to Poetry 2.3.2 and uv 0.9.29

Change effective on 04 February 2026

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

  • Poetry updated from 2.3.1 to 2.3.2 (changelog)
  • uv updated from 0.9.26 to 0.9.29 (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.