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Python buildpacks updated to Poetry 2.2.0 and uv 0.8.18

Change effective on 19 September 2025

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

Poetry updated from 2.1.4 to 2.2.0 (changelog)
uv updated from 0.8.15 to 0.8.18 (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.

Python buildpacks updated to Poetry 2.2.1 and uv 0.8.20 .NET buildpacks auto-detection updated