Deprecate support for the runtime.txt file
#1743
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The `runtime.txt` file is a classic Heroku Python buildpack invention that's not widely supported in the Python ecosystem. Instead, most other tooling (pyenv, package managers, GitHub Actions, dependency update bots etc) support/use the `.python-version` file. As such, we recently added `.python-version` support to both the Python CNB and the classic Python buildpack, and updated all documentation and guides to use it instead of the `runtime.txt` file. eg: https://devcenter.heroku.com/articles/python-runtimes We would prefer apps use the new file, since it helps ensure their deployed app is using the same Python version used locally (via eg pyenv or uv) or in CI. As such this adds a deprecation warning for apps using `runtime.txt`. Closes #1642. GUS-W-16878260.
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runesoerensen
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Feb 5, 2025
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This is the classic Python buildpack equivalent of:
heroku/buildpacks-python#325
The
runtime.txtfile is a classic Heroku Python buildpack invention that's not widely supported in the Python ecosystem. Instead, most other tooling (pyenv, package managers, GitHub Actions, dependency update bots etc) support/use the.python-versionfile.As such, we recently added
.python-versionsupport to both the Python CNB and the classic Python buildpack, and updated all documentation and guides to use it instead of theruntime.txtfile. eg:https://devcenter.heroku.com/articles/python-runtimes
We would prefer apps use the new file, since it helps ensure their deployed app is using the same Python version used locally (via eg pyenv or uv) or in CI.
As such this adds a deprecation warning for apps using
runtime.txt.Closes #1642.
GUS-W-16878260.