v299

• Updated uv from 0.8.5 to 0.8.9. (#1866)

v298

• The Python 3.13 version alias now resolves to Python 3.13.6. (#1861)
• Fixed the stack version check to correctly show the "stack not supported" error message for the EOL Heroku-20, instead of "stack not recognised". (#1860)

v297

• Updated pip from 25.1.1 to 25.2. (#1848)
• Updated Poetry from 2.1.3 to 2.1.4. (#1858)
• Updated uv from 0.8.4 to 0.8.5. (#1857)

v296

• Stopped installing SQLite headers and CLI. (#1854)

v295

• Updated uv from 0.7.20 to 0.8.4. (#1847)
• Reduced the verbosity of pip's Requirement already satisfied: log lines when using Python 3.10 and older. (#1851)

v294

• Improved performance of Python build cache restoration. (#1845)
• Added a build log message for the build cache saving step. (#1844)

v293

• Work around a Pipenv bug when using --system, that causes packages to not be installed correctly if they are also a dependency of Pipenv (such as certifi ). (#1842)

v292

• Updated Pipenv from 2024.0.1 to 2025.0.4. (#1840)
• Fixed the way Pipenv is installed, so that it and its dependencies are installed into a separate virtual environment rather than same environment as the app. If your app inadvertently depended on Pipenv's internal dependencies, you will need to add those dependencies explicitly to your Pipfile. (#1840)
• Stopped installing pip when Pipenv is the chosen package manager. (#1840)
• The build cache is now cleared when using Pipenv if the contents of Pipfile.lock has changed since the last build. This is required to work around Pipenv not uninstalling packages when they are removed from the lockfile. (#1840)
• The build now errors when using Pipenv without its lockfile (Pipfile.lock). This replaces the warning displayed since November 2024. (#1833)

v291

• Updated uv from 0.7.13 to 0.7.20. (#1827 and #1829)
• The build now errors if the Python buildpack has been run multiple times in the same build. This replaces the warning displayed since December 2024. (#1830)
• The build now errors if an existing .heroku/python/ directory is found in the app source. This replaces the warning displayed since December 2024. (#1830)

v290

• Updated uv from 0.7.10 to 0.7.13. (#1819)