Drop Python 3.9, bump tests/builds to Python 3.10 #19099
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AndrewFerr
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Oct 26, 2025
docs/upgrade.md
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| # Upgrading to v1.142.0 | ||
| ## Minimum supported Python version | ||
| The minimum supported Python version has been increased from v3.9 to v3.10. | ||
| You will need Python 3.10+ to run Synapse v1.142.0 (due out Nov 11th, 2025). |
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It goes without saying, but this section may need updating to specify the actual version this PR lands in.
Do this to prevent the trial-olddeps test workflow from installing a version of jaeger-client that pulls in an old version of a dependency (tornado) that is incompatible with Python 3.10.
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MadLittleMods
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Oct 28, 2025
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| DISTS = ( | ||
| "debian:bullseye", # (EOL ~2024-07) (our EOL forced by Python 3.9 is 2025-10-05) | ||
| "debian:bookworm", # (EOL 2026-06) (our EOL forced by Python 3.11 is 2027-10-24) | ||
| "debian:sid", # (rolling distro, no EOL) | ||
| "ubuntu:jammy", # 22.04 LTS (EOL 2027-04) (our EOL forced by Python 3.10 is 2026-10-04) | ||
| "ubuntu:noble", # 24.04 LTS (EOL 2029-06) | ||
| "ubuntu:plucky", # 25.04 (EOL 2026-01) | ||
| "debian:trixie", # (EOL not specified yet) | ||
| ) |
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Not necessarily something for this PR specifically but should this include forky (14) ?
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I suppose that could be done when Synapse is verified to work on forky. I'm unaware of when/if that was done.
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Python 3.9 EOL is on 2025-10-31
Dev notes
Previous times we had to drop Python versions:
Python 3.9
Python 3.8:
Python 3.7:
Pull Request Checklist
EventStoretoEventWorkerStore.".code blocks.