The Fix
pip install requests==2.28.2
Based on closed psf/requests issue #6288 · 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%.
@@ -80,8 +80,8 @@ def check_compatibility(urllib3_version, chardet_version, charset_normalizer_ver
major, minor, patch = charset_normalizer_version.split(".")[:3]
major, minor, patch = int(major), int(minor), int(patch)
- # charset_normalizer >= 2.0.0 < 3.0.0
- assert (2, 0, 0) <= (major, minor, patch) < (3, 0, 0)
+ # charset_normalizer >= 2.0.0 < 4.0.0
repro.py
% pip install --upgrade charset-normalizer
Requirement already satisfied: charset-normalizer in /usr/local/lib/python3.10/site-packages (3.0.0)
Collecting charset-normalizer
Downloading charset_normalizer-3.0.1-cp310-cp310-macosx_10_9_x86_64.whl (124 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 124.2/124.2 kB 2.5 MB/s eta 0:00:00
Installing collected packages: charset-normalizer
Attempting uninstall: charset-normalizer
Found existing installation: charset-normalizer 3.0.0
Uninstalling charset-normalizer-3.0.0:
Successfully uninstalled charset-normalizer-3.0.0
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
requests 2.28.1 requires charset-normalizer<3,>=2, but you have charset-normalizer 3.0.1 which is incompatible.
Successfully installed charset-normalizer-3.0.1
verify
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
fix.md
Option A — Upgrade to fixed release\npip install requests==2.28.2\nWhen NOT to use: Do not use if it changes public behavior or if the failure cannot be reproduced.\n\n
Why This Fix Works in Production
- Trigger: ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following…
- Mechanism: Allows charset-normalizer version 3.x to be used with requests, addressing compatibility issues.
- Why the fix works: Allows charset-normalizer version 3.x to be used with requests, addressing compatibility issues. (first fixed release: 2.28.2).
Production impact:
- 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
- Shows up under Python 3.10 in real deployments (not just unit tests).
- Surfaces as: ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
Proof / Evidence
- GitHub issue: #6288
- Fix PR: https://github.com/psf/requests/pull/6261
- First fixed release: 2.28.2
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.85
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.39
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“This is addressed in https://github.com/psf/requests/pull/6261 but hasn't been released yet. For what it's worth, this is on the 2.29.0 milestone.”
Failure Signature (Search String)
- ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
Error Message
Stack trace
error.txt
Error Message
-------------
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
Minimal Reproduction
repro.py
% pip install --upgrade charset-normalizer
Requirement already satisfied: charset-normalizer in /usr/local/lib/python3.10/site-packages (3.0.0)
Collecting charset-normalizer
Downloading charset_normalizer-3.0.1-cp310-cp310-macosx_10_9_x86_64.whl (124 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 124.2/124.2 kB 2.5 MB/s eta 0:00:00
Installing collected packages: charset-normalizer
Attempting uninstall: charset-normalizer
Found existing installation: charset-normalizer 3.0.0
Uninstalling charset-normalizer-3.0.0:
Successfully uninstalled charset-normalizer-3.0.0
ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
requests 2.28.1 requires charset-normalizer<3,>=2, but you have charset-normalizer 3.0.1 which is incompatible.
Successfully installed charset-normalizer-3.0.1
Environment
- Python: 3.10
Fix Options (Details)
Option A — Upgrade to fixed release Safe default (recommended)
pip install requests==2.28.2
When NOT to use: Do not use if it changes public behavior or if the failure cannot be reproduced.
Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.
Fix reference: https://github.com/psf/requests/pull/6261
First fixed release: 2.28.2
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- Do not use if it changes public behavior or if the failure cannot be reproduced.
Verify Fix
verify
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Add a TLS smoke test that performs a real handshake in CI (include CA bundle validation and hostname checks).
- Alert on handshake failures by error string and endpoint to catch cert/CA changes quickly.
Version Compatibility Table
| Version | Status |
|---|---|
| 2.28.2 | Fixed |
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.