The Fix
pip install urllib3==1.25
Based on closed urllib3/urllib3 issue #1392 · 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%.
@@ -1,28 +1,40 @@
@@ -1,28 +1,40 @@
language: python
-script:
- - ./_travis/run.sh
+sudo: false
Option A — Upgrade to fixed release\npip install urllib3==1.25\nWhen NOT to use: This fix is not suitable if manual control over releases is required.\n\n
Why This Fix Works in Production
- Trigger: 1. Add a single commit to that branch that updates the version in `urllib3/__init__.py` and `CHANGES.rst`.
- Mechanism: The release process was inefficient and lacked automation for version updates
- Why the fix works: Revises the release process to streamline version updates and automate deployment to GitHub and PyPI. (first fixed release: 1.25).
- 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 release process was inefficient and lacked automation for version updates
- Production symptom (often without a traceback): 1. Add a single commit to that branch that updates the version in `urllib3/__init__.py` and `CHANGES.rst`.
Proof / Evidence
- GitHub issue: #1392
- Fix PR: https://github.com/urllib3/urllib3/pull/1508
- First fixed release: 1.25
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.95
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.79
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“That's exactly what I'm proposing. I updated my comment to be a little more explicit on that. The release-MAJOR.MINOR.PATCH branch is just short-lived branch to…”
“Oh I forgot to justify this, here's some benefits: 1. Requires a set of eyeballs *and* CI to pass before a release is cut. 2.…”
“What if we did away with release branches entirely and just stuck with master? Like you said, any branch can be a release branch as…”
“Sorry I misunderstood from the formatting of the release branches! I'm 100% on board having our release process be automated with this model. Eager to…”
Failure Signature (Search String)
- 1. Add a single commit to that branch that updates the version in `urllib3/__init__.py` and `CHANGES.rst`.
- Nope but avoids confusion and silly errors like #1393.
Copy-friendly signature
Failure Signature
-----------------
1. Add a single commit to that branch that updates the version in `urllib3/__init__.py` and `CHANGES.rst`.
Nope but avoids confusion and silly errors like #1393.
Error Message
Signature-only (no traceback captured)
Error Message
-------------
1. Add a single commit to that branch that updates the version in `urllib3/__init__.py` and `CHANGES.rst`.
Nope but avoids confusion and silly errors like #1393.
What Broke
Manual release processes led to potential errors and delays in deployment.
Why It Broke
The release process was inefficient and lacked automation for version updates
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install urllib3==1.25
Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.
Fix reference: https://github.com/urllib3/urllib3/pull/1508
First fixed release: 1.25
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- This fix is not suitable if manual control over releases is required.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Add a CI check that diffs key outputs after upgrades (OpenAPI schema snapshots, JSON payload shapes, CLI output).
- Upgrade behind a canary and run integration tests against the canary before 100% rollout.
Version Compatibility Table
| Version | Status |
|---|---|
| 1.25 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.