Bump pip from 26.0.1 to 26.1.1

[dependabot]

Bumps pip from 26.0.1 to 26.1.1.

Changelog

Sourced from pip's changelog.

26.1.1 (2026-05-04)

Bug Fixes

• Fix issue where uninstallation left behind empty directories. Revert the removal of the adjacent __pycache__ directory when a .py file is removed. ([#13973](https://github.com/pypa/pip/issues/13973) <https://github.com/pypa/pip/issues/13973>_)

26.1 (2026-04-26)

Deprecations and Removals

• Drop support for Python 3.9. ([#13795](https://github.com/pypa/pip/issues/13795) <https://github.com/pypa/pip/issues/13795>_)

Features

• Add experimental support to read requirements from standardized pylock.toml files (-r pylock.toml). ([#13876](https://github.com/pypa/pip/issues/13876) <https://github.com/pypa/pip/issues/13876>_)
• Allow --uploaded-prior-to to accept a duration in days (e.g., P3D for 3 days ago). ([#13674](https://github.com/pypa/pip/issues/13674) <https://github.com/pypa/pip/issues/13674>_)

Enhancements

• Speed up dependency resolution when there are complex conflicts. ([#13859](https://github.com/pypa/pip/issues/13859) <https://github.com/pypa/pip/issues/13859>_)
• Reduce memory usage when resolving large dependency trees. ([#13843](https://github.com/pypa/pip/issues/13843) <https://github.com/pypa/pip/issues/13843>_)
• Emit a deprecation warning when pip imports an unexpected module after installation of a distribution has started. ([#13912](https://github.com/pypa/pip/issues/13912) <https://github.com/pypa/pip/issues/13912>_)
• Allow URL constraints to apply to requirements with extras. ([#12018](https://github.com/pypa/pip/issues/12018) <https://github.com/pypa/pip/issues/12018>_)
• Allow unpinned requirements to use hashes from constraints. Constraints like {name}=={version} --hash=... feeds into hash verification for a corresponding requirement. ([#9243](https://github.com/pypa/pip/issues/9243) <https://github.com/pypa/pip/issues/9243>_)
• Improve conflict reports that involve direct URLs. ([#13932](https://github.com/pypa/pip/issues/13932) <https://github.com/pypa/pip/issues/13932>_)
• Show all errors instead of first error for faulty dependency_groups definitions. ([#13917](https://github.com/pypa/pip/issues/13917) <https://github.com/pypa/pip/issues/13917>_)

Bug Fixes

• Fix recovery hint for missing RECORD file to use --ignore-installed instead of --force-reinstall. ([#12645](https://github.com/pypa/pip/issues/12645) <https://github.com/pypa/pip/issues/12645>_)
• Fix misleading error message when a constraint file cannot be opened. ([#13226](https://github.com/pypa/pip/issues/13226) <https://github.com/pypa/pip/issues/13226>_)
• Show the filename rather than the full URL when downloading files from non-PyPI indexes in non-verbose mode. ([#13494](https://github.com/pypa/pip/issues/13494) <https://github.com/pypa/pip/issues/13494>_)
• Remove the adjacent __pycache__ directory when a .py file is removed. ([#13725](https://github.com/pypa/pip/issues/13725) <https://github.com/pypa/pip/issues/13725>_)
• Force UTF-8 encoding for :pep:723 metadata. ([#13861](https://github.com/pypa/pip/issues/13861) <https://github.com/pypa/pip/issues/13861>_)
• Minor performance improvement when filtering candidates during resolution. ([#13916](https://github.com/pypa/pip/issues/13916) <https://github.com/pypa/pip/issues/13916>_)
• Fix a hang on Windows when stdout is closed during verbose output. ([#13927](https://github.com/pypa/pip/issues/13927) <https://github.com/pypa/pip/issues/13927>_)
• Common path prefixes are determined by path segment, not character by character. ([#13847](https://github.com/pypa/pip/issues/13847) <https://github.com/pypa/pip/issues/13847>_)
• Fix installing .tar.gz source distributions that look like a zip file. ([#13867](https://github.com/pypa/pip/issues/13867) <https://github.com/pypa/pip/issues/13867>_)

... (truncated)

Commits

• 4432a37 Bump for release
• 4943e17 Merge pull request #13973 from pypa/revert-13725-vfazio-remove-all-optimizati...
• e9e7b90 Add news
• 0ff6964 Revert "Remove pycache when package is removed"
• cc6b082 Merge pull request #13951 from sbidoul/release/26.1
• b2671f1 Bump for development
• 90b2b3e Bump for release
• 193f289 Update AUTHORS.txt
• 63c3709 Merge pull request #13876 from sbidoul/install-from-pylock-reqs-sbi
• e5fe702 Merge pull request #13949 from pypa/revert-13888-resolver-editable-links
• Additional commits viewable in compare view

[codspeed-hq]

Merging this PR will not alter performance

✅ 67 untouched benchmarks
⏩ 4 skipped benchmarks¹

---

_{Comparing dependabot/pip/3.14/pip-26.1.1 (c9f3974) with 3.14 (299693b)²}

Footnotes

1. 4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on 3.14 (e1dc665) during the generation of this report, so 299693b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (3.14@77872ab). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.14   #12481   +/-   ##
=======================================
  Coverage        ?   98.20%           
=======================================
  Files           ?      135           
  Lines           ?    47132           
  Branches        ?     2526           
=======================================
  Hits            ?    46284           
  Misses          ?      671           
  Partials        ?      177           

Flag	Coverage Δ
CI-GHA	98.26% <ø> (?)
OS-Linux	98.02% <ø> (?)
OS-Windows	95.66% <ø> (?)
OS-macOS	97.20% <ø> (?)
Py-3.10.11	96.69% <ø> (?)
Py-3.10.20	97.17% <ø> (?)
Py-3.11.15	97.44% <ø> (?)
Py-3.11.9	96.98% <ø> (?)
Py-3.12.10	97.06% <ø> (?)
Py-3.12.13	97.53% <ø> (?)
Py-3.13.13	97.74% <ø> (?)
Py-3.14.4	97.80% <ø> (?)
Py-3.14.4t	96.83% <ø> (?)
Py-pypy3.11.15-7.3.21	96.67% <ø> (?)
VM-macos	97.20% <ø> (?)
VM-ubuntu	98.02% <ø> (?)
VM-windows	95.66% <ø> (?)
cython-coverage	38.09% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

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