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psych

Psych is a YAML parser and emitter

About
chacktoberfestjavalibyamlpsychrubyyaml-parser
github.com/ruby/psychMITAaron Patterson, SHIBATA Hiroshi, Charles Oliver Nutter596 · 224 forks · 126 contributors
Compare
Compares against 5.5.0 (latest stable)
Latest Stable5.5.0Aug 21, 2026
Latest RC5.1.0.pre1Jan 26, 2023
Latest Beta5.2.0.beta7Nov 7, 2024
Release cadenceEvery month
Last releaseAug 21, 2026
Open advisories0
Changelog quality100% curated
GitHub Releases
Release history SecurityYou're on
5.x
STABLE · RCPRE-RELEASEOct2024AprJulOct2025AprJulOct2026AprJul

68 older or filtered releases not shown.

Upgrade guides

Breaking changes and a migration checklist for each major version
psych 4 → 54.0.6 → 5.5.0Aug 21, 2026 UnknownSecurity1New5Changed14Fixed22Other34psych 3 → 43.3.4 → 4.0.6Sep 28, 2022 Unknownpsych 2 → 32.2.4 → 3.3.4Sep 28, 2022 Unknownpsych 1 → 21.3.4 → 2.2.4Feb 24, 2017 Unknown
VersionChannelDateChangesSecurity
5.5.0 StableAug 21, 2026Security1New1Fixed4Other25.4.0 youStableJun 2, 2026Changed3Fixed1Other25.3.1 StableDec 17, 2025Changed25.3.0 StableDec 10, 2025New1Changed2Fixed3Other85.2.6 StableMay 12, 2025Fixed15.2.5 StableMay 9, 2025New1Fixed4Other15.2.4 StableMay 1, 2025Changed1Fixed3Other55.2.3 StableJan 17, 2025Changed1Fixed1Other55.2.2 StableDec 18, 2024Fixed1Other15.2.1 StableDec 2, 2024Fixed1Other25.2.0 StableNov 7, 2024New2Changed3Fixed3Other85.2.0.beta7 BetaNov 7, 2024No changes listed5.2.0.beta6 BetaNov 7, 2024No changes listed5.2.0.beta5 BetaNov 7, 2024No changes listed5.2.0.beta4 BetaNov 7, 2024No changes listed5.2.0.beta3 BetaNov 7, 2024No changes listed5.2.0.beta2 BetaNov 7, 2024No changes listed5.2.0.beta1 BetaSep 9, 2024No changes listed5.1.2 StableDec 19, 2023Changed25.1.1.1 StableOct 16, 2023No changes listed