Bump packaging from 25.0 to 26.0

[dependabot]

Bumps packaging from 25.0 to 26.0.

Release notes

Sourced from packaging's releases.

26.0

Read about the performance improvements here: https://iscinumpy.dev/post/packaging-faster.

What's Changed

Features:

• PEP 751: support pylock by @​sbidoul in pypa/packaging#900
• PEP 794: import name metadata by @​brettcannon in pypa/packaging#948
• Support writing metadata by @​henryiii in pypa/packaging#846
• Support __replace__ for Version by @​henryiii in pypa/packaging#1003
• Support positional pattern matching for Version and Specifier by @​henryiii in pypa/packaging#1004

Behavior adaptations:

• PEP 440 handling of prereleases for Specifier.contains, SpecifierSet.contains, and SpecifierSet.filter by @​notatallshaw in pypa/packaging#897
• Handle PEP 440 edge case in SpecifierSet.filter by @​notatallshaw in pypa/packaging#942
• Adjust arbitrary equality intersection preservation in SpecifierSet by @​notatallshaw in pypa/packaging#951
• Return False instead of raising for .contains with invalid version by @​Liam-DeVoe in pypa/packaging#932
• Support arbitrary equality on arbitrary strings for Specifier and SpecifierSet's filter and contains method. by @​notatallshaw in pypa/packaging#954
• Only try to parse as Version on certain marker keys, return False on unequal ordered comparsions by @​JP-Ellis in pypa/packaging#939

Fixes:

• Update _hash when unpickling Tag() by @​dholth in pypa/packaging#860
• Correct comment and simplify implicit prerelease handling in Specifier.prereleases by @​notatallshaw in pypa/packaging#896
• Use explicit _GLibCVersion NamedTuple in _manylinux by @​cthoyt in pypa/packaging#868
• Detect invalid license expressions containing () by @​bwoodsend in pypa/packaging#879
• Correct regex for metadata 'name' format by @​di in pypa/packaging#925
• Improve the message around expecting a semicolon by @​pradyunsg in pypa/packaging#833
• Support nested parens in license expressions by @​Liam-DeVoe in pypa/packaging#931
• Add space before at symbol in Requirements string by @​henryiii in pypa/packaging#953
• A root logger use found by ruff LOG, use packaging logger instead by @​henryiii in pypa/packaging#965
• Better support for subclassing Marker and Requirement by @​henryiii in pypa/packaging#1022
• Normalize all extras, not just if it comes first by @​henryiii in pypa/packaging#1024
• Don't produce a broken repr if Marker fails to construct by @​henryiii in pypa/packaging#1033

Performance:

• Avoid recompiling regexes in the tokenizer for a 3x speedup by @​hauntsaninja in pypa/packaging#1019
• Improve performance in _manylinux.py by @​cthoyt in pypa/packaging#869
• Minor cleanups to Version by @​bearomorphism in pypa/packaging#913
• Skip redundant creation of Versions in specifier comparison by @​notatallshaw in pypa/packaging#986
• Cache Specifier's Version by @​notatallshaw in pypa/packaging#985
• Make Version a little faster by @​henryiii in pypa/packaging#987
• Minor Version regex cleanup by @​henryiii in pypa/packaging#990
• Faster regex on Python 3.11.5+ by @​henryiii in pypa/packaging#988 and pypa/packaging#1055
• Lazily calculate _key in Version by @​notatallshaw in pypa/packaging#989 and regression for packaging_legacy fixed by @​henryiii in pypa/packaging#1048
• Faster canonicalize_version by @​henryiii in pypa/packaging#993
• Use fullmatch in a couple more places by @​henryiii in pypa/packaging#992

... (truncated)

Changelog

Sourced from packaging's changelog.

26.0 - 2026-01-20

Features:

PEP 751: support pylock (:pull:900)
PEP 794: import name metadata (:pull:948)
Support for writing metadata to a file (:pull:846)
Support __replace__ on Version (:pull:1003)
Support positional pattern matching for Version and SpecifierSet (:pull:1004)

Behavior adaptations:

PEP 440 handling of prereleases for Specifier.contains, SpecifierSet.contains, and SpecifierSet.filter (:pull:897)
Handle PEP 440 edge case in SpecifierSet.filter (:pull:942)
Adjust arbitrary equality intersection preservation in SpecifierSet (:pull:951)
Return False instead of raising for .contains with invalid version (:pull:932)
Support arbitrary equality on arbitrary strings for Specifier and SpecifierSet's filter and contains method. (:pull:954)
Only try to parse as Version on certain marker keys, return False on unequal ordered comparisons (:pull:939)

Fixes:

Update _hash when unpickling Tag() (:pull:860)
Correct comment and simplify implicit prerelease handling in Specifier.prereleases (:pull:896)
Use explicit _GLibCVersion NamedTuple in _manylinux (:pull:868)
Detect invalid license expressions containing () (:pull:879)
Correct regex for metadata 'name' format (:pull:925)
Improve the message around expecting a semicolon (:pull:833)
Support nested parens in license expressions (:pull:931)
Add space before at symbol in Requirements string (:pull:953)
A root logger use found, use a packaging logger instead (:pull:965)
Better support for subclassing Marker and Requirement (:pull:1022)
Normalize all extras, not just if it comes first (:pull:1024)
Don't produce a broken repr if Marker fails to construct (:pull:1033)

Performance:

Avoid recompiling regexes in the tokenizer for a 3x speedup (:pull:1019)
Improve performance in _manylinux.py (:pull:869)
Minor cleanups to Version (:pull:913)
Skip redundant creation of Version's in specifier comparison (:pull:986)
Cache the Specifier's Version (:pull:985)
Make Version a little faster (:pull:987)
Minor Version regex cleanup (:pull:990)
Faster regex on Python 3.11.5+ for Version (:pull:988, :pull:1055)
Lazily calculate _key in Version (:pull:989, :pull:1048)
Faster canonicalize_version (:pull:993)
Use re.fullmatch in a couple more places (:pull:992, :pull:1029)
Use map instead of generator (:pull:996)
Deprecate ._version (_Version, a NamedTuple) (:pull:995, :pull:1062)

</tr></table>

... (truncated)

Commits

• 3b77a26 Bump for release
• 31371cc docs: prepare for 26.0 final (#1063)
• 9627a88 perf: dual replace (#1064)
• d5398b8 fix: restore ._version as a compat shim (#1062)
• 3a7b600 Bump for development
• d4eefdc Bump for release
• 4618912 docs: prepare for 26.0rc3 (#1060)
• 0cf1b41 ci: test on first public release of CPythons (#1056)
• 716beb1 perf: 10% faster stripping zeros (#1058)
• 350a230 fix: support CPython 3.11.0-3.11.4 and older PyPy3.11 (#1055)
• Additional commits viewable in compare view

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[deepsource-io]

DeepSource Code Review

We reviewed changes in dfdbc9d...1ad76ea on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		Mar 1, 2026 10:04a.m.	Review ↗