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PyYAML

YAML parser and emitter for Python

About
pythonyaml
github.com/yaml/pyyamlpyyaml.org/MITKirill Simonov3k · 628 forks · 40 contributors
Compare
Compares against 6.0.3 (latest stable)
Latest Stable6.0.3Sep 25, 2025
Latest RC3.13rc1Jul 4, 2018
Latest Beta6.0b1Oct 4, 2021
Release cadenceEvery 4 months
Last releaseSep 25, 2025
Open advisories0
Changelog quality31% curated
CHANGELOG + GitHub Releases, gaps for some releases
Release history Security
6.x
STABLE · RCPRE-RELEASEOct2023AprJulOct2024AprJulOct2025AprJul

27 older or filtered releases not shown.

Upgrade guides

Breaking changes and a migration checklist for each major version
PyYAML 5 → 65.4.1 → 6.0.3Sep 25, 2025 BreakingPlatform3Changed1Other1PyYAML 3 → 53.13 → 5.4.1Jan 20, 2021 BreakingSecurity5Platform1Deprecated1New3Changed5Fixed6Other18
VersionChannelDateChangesSecurity
6.0.3 StableSep 25, 2025Platform16.0.2 StableAug 6, 2024Platform16.0.2rc1 YankedJun 10, 2024Platform1Changed1Other16.0.1 StableJul 17, 2023No notes published6.0 StableOct 13, 2021No notes published6.0b1 BetaOct 4, 2021No notes published5.4.1 youStableJan 20, 2021No notes published5.4 StableJan 19, 2021Security1Fix5.4b2 BetaJan 14, 2021No notes published5.4b1 BetaJan 14, 2021No notes published5.3.1 StableMar 18, 2020Security1Fix5.3 StableJan 6, 2020No notes published5.3b1 BetaDec 21, 2019No notes published5.2 StableDec 2, 2019Security1Fixed2Other15.2b1 BetaNov 26, 2019Security1Fix5.1.2 StableJul 31, 2019Fixed15.1.1 StableJun 6, 2019Fixed15.1 StableMar 13, 2019Security1Platform1Deprecated1New3Changed5Fixed2Other17Fix5.1b7 BetaMar 13, 2019No notes published5.1b5 BetaMar 7, 2019No notes published