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The bot runs on a single interpreter, the one in the Dockerfile, so the test matrix only needs the version the image runs on, the previous one as a fallback, and the next one once it exists. Python 3.13 entered security-only mode on 2026-10-01 and 3.11 and 3.12 were already there, so stop testing on them and build the image on 3.15, the current release. 3.16 joins the matrix once actions/setup-python ships its first alpha. runtime.txt was only read by Heroku, which no longer runs the bot.
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Mariatta
marked this pull request as ready for review
October 21, 2026 04:46
hugovk
approved these changes
Oct 21, 2026
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The bot runs on a single interpreter, the one in the Dockerfile, so the test matrix only needs the version the image runs on, the previous one as a fallback, and the next one once it exists. Python 3.13 entered security-only mode on 2026-10-01, and 3.11 and 3.12 were already there.
python:3.15-slim, the current release.runtime.txt, which only Heroku read. The bot now runs on cabotage, which reads the Procfile.The test suite passes on 3.14 and 3.15, and the image builds locally.
This deliberately changes the approach from the recent "drop EOL versions" PRs: for a deployed app, versions in security-only mode that the image never runs on add CI time without telling us anything.
The 3.11-slim image also ships an old pip (24.0), which the Docker build job warns about. python:3.15-slim ships pip 26.2.1, one patch behind the current 26.2.2, so the warning goes away with this change.