The Fix
pip install celery==5.5.3
Based on closed celery/celery issue #9727 · PR/commit linked
Production note: This usually shows up under retries/timeouts. Treat it as a side-effect risk until you can verify behavior with a canary + real traffic.
@@ -39,24 +39,20 @@ What do I need?
.. sidebar:: Version Requirements
- :subtitle: Celery version 5.3 runs on
-
- - Python ❨3.8, 3.9, 3.10, 3.11❩
Option A — Upgrade to fixed release\npip install celery==5.5.3\nWhen NOT to use: This fix should not be applied if the documentation is already accurate.\n\n
Why This Fix Works in Production
- Trigger: - [x] I have included all related issues and possible duplicate issues in this issue
- Mechanism: The documentation listed outdated Python versions and incorrect Celery version
- Why the fix works: Updated the documentation to reflect the correct supported Python versions and the current Celery version. (first fixed release: 5.5.3).
- If left unfixed, the same config can fail only in production (env differences), causing startup failures or partial feature outages.
Why This Breaks in Prod
- The documentation listed outdated Python versions and incorrect Celery version
- Production symptom (often without a traceback): - [x] I have included all related issues and possible duplicate issues in this issue
Proof / Evidence
- GitHub issue: #9727
- Fix PR: https://github.com/celery/celery/pull/9728
- First fixed release: 5.5.3
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.95
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.76
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“thanks for the report! here is a PR to fix this https://github.com/celery/celery/pull/9728”
“the new PR is showing properly in dev branch https://docs.celeryq.dev/en/main/getting-started/introduction.html”
Failure Signature (Search String)
- - [x] I have included all related issues and possible duplicate issues in this issue
- or possible duplicates to this issue as requested by the checklist above.
Copy-friendly signature
Failure Signature
-----------------
- [x] I have included all related issues and possible duplicate issues in this issue
or possible duplicates to this issue as requested by the checklist above.
Error Message
Signature-only (no traceback captured)
Error Message
-------------
- [x] I have included all related issues and possible duplicate issues in this issue
or possible duplicates to this issue as requested by the checklist above.
What Broke
Users may encounter compatibility issues due to outdated version requirements in documentation.
Why It Broke
The documentation listed outdated Python versions and incorrect Celery version
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install celery==5.5.3
Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.
Fix reference: https://github.com/celery/celery/pull/9728
First fixed release: 5.5.3
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- This fix should not be applied if the documentation is already accurate.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Capture the exact failing error string in logs and tests so you can reproduce via a minimal script.
- Pin production dependencies and upgrade only with a reproducible test that hits the failing path.
Version Compatibility Table
| Version | Status |
|---|---|
| 5.5.3 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.