The Fix
pip install celery==5.0.3
Based on closed celery/celery issue #6497 · PR/commit linked
Production note: Most teams hit this during upgrades or environment changes. Roll out with a canary and smoke critical endpoints (health, OpenAPI/docs) before 100%.
@@ -103,10 +103,10 @@ Enabling
Celery initially ships the plugin in a disabled state, to enable it you can either:
- * `pip install celery[pytest]`
- * `pip install pytest-celery`
- * or add an environment variable `PYTEST_PLUGINS=celery.contrib.pytest`
Option A — Upgrade to fixed release\npip install celery==5.0.3\nWhen NOT to use: This fix should not be applied if smart quotes are intended for stylistic purposes.\n\n
Why This Fix Works in Production
- Trigger: The tiny code segment below uses smart quotes, this doesn't work when you paste it into your code.
- Mechanism: Smart quotes in the documentation code snippet caused issues when copied into code
- Why the fix works: Removed smart quotes from the code snippet in the testing documentation to ensure proper functionality when copied. (first fixed release: 5.0.3).
- 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
- Smart quotes in the documentation code snippet caused issues when copied into code
- Production symptom (often without a traceback): The tiny code segment below uses smart quotes, this doesn't work when you paste it into your code.
Proof / Evidence
- GitHub issue: #6497
- Fix PR: https://github.com/celery/celery/pull/6507
- First fixed release: 5.0.3
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.85
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.69
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“Oh, I didn't realise this was in this repo :)”
“@stuaxo looks like the change that got linked above would be easy to merge. Could you make a PR for us?”
“Thanks, looks like I didn't hit the button :) https://github.com/celery/celery/pull/6507”
Failure Signature (Search String)
- The tiny code segment below uses smart quotes, this doesn't work when you paste it into your code.
Copy-friendly signature
Failure Signature
-----------------
The tiny code segment below uses smart quotes, this doesn't work when you paste it into your code.
@stuaxo looks like the change that got linked above would be easy to merge. Could you make a PR for us?
Error Message
Signature-only (no traceback captured)
Error Message
-------------
The tiny code segment below uses smart quotes, this doesn't work when you paste it into your code.
@stuaxo looks like the change that got linked above would be easy to merge. Could you make a PR for us?
What Broke
Users experienced errors when pasting the code snippet due to smart quotes.
Why It Broke
Smart quotes in the documentation code snippet caused issues when copied into code
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install celery==5.0.3
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/6507
First fixed release: 5.0.3
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- This fix should not be applied if smart quotes are intended for stylistic purposes.
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 |
|---|---|
| 5.0.3 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.