Python classic buildpack updated to Pipenv 2026.0.3

Change effective on 08 January 2026

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

  • Pipenv updated from 2025.0.4 to 2026.0.3 (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.