PyPI

packaging

Core utilities for Python packages

github.com/pypa/packaging packaging.pypa.io/Apache-2.0Donald Stufft426M / week755 · 369 forks · 158 contributors

I'm on version…

Compares against 26.3 (latest stable)

Latest Stable26.3Aug 4, 2026

Latest RC26.0rc3Jan 15, 2026

Release cadenceEvery 3 months

Last releaseAug 4, 2026

Open advisories0

Changelog quality100% curated

CHANGELOG + GitHub Releases

Release history SecurityYou're on

23.x24.x25.x26.x

STABLE · RCPRE-RELEASE Oct2024AprJulOct2025AprJulOct2026AprJul

42 older or filtered releases not shown.

Upgrade guides

Breaking changes and a migration checklist for each major version

packaging 25 → 2625.0 → 26.3Aug 4, 2026 Breaking121246568112 packaging 24 → 2524.2 → 25.0Apr 19, 2025 Safe22 packaging 23 → 2423.2 → 24.2Nov 8, 2024 Breaking2510729 packaging 22 → 2322.0 → 23.2Oct 1, 2023 Review needed147923 packaging 21 → 2221.3 → 22.0Dec 7, 2022 Breaking31312527 packaging 20 → 2120.9 → 21.3Nov 18, 2021 Breaking24933 packaging 19 → 2019.2 → 20.9Jan 29, 2021 Breaking215852 packaging 18 → 1918.0 → 19.2Sep 18, 2019 Review needed226 packaging 17 → 1817.1 → 18.0Sep 26, 2018 Review needed1 packaging 16 → 1716.8 → 17.1Feb 28, 2018 Breaking1311 packaging 15 → 1615.3 → 16.8Oct 29, 2016 Safe661 packaging 14 → 1514.5 → 15.3Aug 2, 2015 Review needed513

VersionChannelDateChangesSecurity

26.3 StableAug 4, 202616114010 26.2 youStableApr 24, 202637 26.1 StableApr 14, 202611320624 26.0 StableJan 21, 2026115331771 26.0rc3 RCJan 15, 2026114 26.0rc2 RCJan 12, 2026115 26.0rc1 RCJan 9, 2026115321462 25.0 StableApr 19, 202522 24.2 StableNov 8, 2024137411 24.1 StableJun 9, 2024116 24.0 StableMar 10, 202423212 23.2 StableOct 1, 2023132512 23.1 StableApr 12, 20231415 23.0 StableJan 8, 2023136 22.0 StableDec 7, 202231312527 21.3 StableNov 18, 2021111 21.2 StableOct 29, 2021No changes listed 21.1 StableOct 29, 20211113 21.0 StableJul 3, 20211272 20.9 StableJan 29, 202121