Outage in Python
PyPI Partial Outage
Resolved MajorIncident Report
We are working to investigate a partial outage in the PyPI backends.
Components affected
Python pypi.org - BackendsTrusted by 1000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
11 months ago - at 05/27/2025 12:53PM
We have not seen a return of the traffic that caused this incident after removing the temporary block. We will open a new incident if we need to take action again.
MONITORING
11 months ago - at 05/25/2025 12:16PM
We have removed the temporary block and are continuing to monitor.
MONITORING
11 months ago - at 05/24/2025 11:54PM
Our block is in place and systems are stable, but we are not satisfied with having to block such a generic user-agent. If you are aware of a system that began a mass crawl of PyPI's JSON release endpoints starting at around 22:05 UTC 2025-05-25, please contact admin@pypi.org.
IDENTIFIED
11 months ago - at 05/24/2025 11:37PM
We have identified a flood of requests from a cluster using the `python-requests/2.32.3` User-Agent, and attempting to hit all JSON project/releasese en masse.
This causes excessive cache misses, which are overwhelming our backends. A temporary block has been put in place.
IDENTIFIED
11 months ago - at 05/24/2025 11:11PM
We have identified a large increase in CDN cache misses causing excess load on our backends. We are working to determine the reason for this increase.
INVESTIGATING
11 months ago - at 05/24/2025 10:57PM
We are working to investigate a partial outage in the PyPI backends.
Latest Python outages
Python Infrastructure Outage - about 1 month ago
API Traffic experiencing intermittent failures - about 2 months ago
PyPI Uploads failing - 3 months ago
Slow updates to PyPI pages/API responses - 5 months ago
PyPI Search Index Degraded - 9 months ago
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