The Fix
pip install celery==5.3.0rc1
Based on closed celery/celery issue #8187 · 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.
@@ -98,4 +98,6 @@ SQLAlchemy
SQLAlchemy is a backend.
-It allows Celery to interface with MySQL, PostgreSQL, SQlite, and more. It is a ORM, and is the way Celery can use a SQL DB as a result backend. Historically, SQLAlchemy has not been the most stable result backend so if chosen one should proceed with caution.
+It allows Celery to interface with MySQL, PostgreSQL, SQlite, and more. It is a ORM, and is the way Celery can use a SQL DB as a result backend.
+
Option A — Upgrade to fixed release\npip install celery==5.3.0rc1\nWhen NOT to use: This fix is inappropriate if SQLAlchemy is genuinely unstable in specific use cases.\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 inaccurately labeled SQLAlchemy as a possibly unstable backend
- Why the fix works: Updated documentation to remove the statement regarding SQLAlchemy as a possibly unstable backend and added a reference to the configuration documentation. (first fixed release: 5.3.0rc1).
- 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 inaccurately labeled SQLAlchemy as a possibly unstable backend
- Production symptom (often without a traceback): - [ x] I have included all related issues and possible duplicate issues in this issue
Proof / Evidence
- GitHub issue: #8187
- Fix PR: https://github.com/celery/celery/pull/8188
- First fixed release: 5.3.0rc1
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.85
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.66
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“Hey @mdeshmu :wave:, Thank you for opening an issue”
“yeah SQLA is now reliable back end. you can proceed with a PR”
“Put out a PR fixing this: https://github.com/celery/celery/pull/8188”
Failure Signature (Search String)
- - [ x] I have included all related issues and possible duplicate issues in this issue
Copy-friendly signature
Failure Signature
-----------------
- [ x] I have included all related issues and possible duplicate issues in this issue
Error Message
Signature-only (no traceback captured)
Error Message
-------------
- [ x] I have included all related issues and possible duplicate issues in this issue
What Broke
Users may be misled about the stability of SQLAlchemy as a result backend.
Why It Broke
The documentation inaccurately labeled SQLAlchemy as a possibly unstable backend
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install celery==5.3.0rc1
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/8188
First fixed release: 5.3.0rc1
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- This fix is inappropriate if SQLAlchemy is genuinely unstable in specific use cases.
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 |
|---|---|
| 5.3.0rc1 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.