RubyGems
concurrent-ruby
Modern concurrency tools for Ruby. Inspired by Erlang, Clojure, Scala, Haskell, F#, C#, Java, and classic concurrency patterns.
concurrencyruby
github.com/ruby-concurrency/concurrent-rubywww.concurrent-ruby.comMITJerry D'Antonio, Petr Chalupa, The Ruby Concurrency Team5.8k · 422 forks · 178 contributors
Release cadenceEvery 2 months
Last releaseJul 19, 2026
Open advisories0
Changelog quality90% curated
GitHub Releases, gaps for some releases
Release history SecurityYou're on
69 older or filtered releases not shown.
Upgrade guides
Breaking changes and a migration checklist for each major versionconcurrent-ruby 0.9 → 10.9.2 → 1.3.8Jul 19, 2026 BreakingBreaking1Security3New6Changed7Fixed12Other23concurrent-ruby 0.8 → 0.90.8.0 → 0.9.2Nov 4, 2015 Unknownconcurrent-ruby 0.7 → 0.80.7.2 → 0.8.0Jan 25, 2015 Unknownconcurrent-ruby 0.6 → 0.70.6.1 → 0.7.2Jan 25, 2015 Unknownconcurrent-ruby 0.5 → 0.60.5.0 → 0.6.1Jun 15, 2014 Unknownconcurrent-ruby 0.4 → 0.50.4.1 → 0.5.0Mar 16, 2014 Unknownconcurrent-ruby 0.3 → 0.40.3.2 → 0.4.1Feb 4, 2014 Unknownconcurrent-ruby 0.2 → 0.30.2.2 → 0.3.2Nov 8, 2013 Unknownconcurrent-ruby 0.1 → 0.20.1.1 → 0.2.2Aug 20, 2013 Unknownconcurrent-ruby 0.0 → 0.10.0.1 → 0.1.1Jul 29, 2013 Unknown
VersionChannelDateChangesSecurity
1.3.8 StableJul 19, 2026New1Fixed11.3.7 StableJun 16, 2026Security3Fixed1Other2Fix1.3.6 StableDec 13, 2025Changed2Fixed3Other71.3.5 StableJan 15, 2025Changed1Fixed1Other21.3.4 StableAug 10, 2024New1Fixed1Other21.3.3 StableJun 9, 2024Changed11.3.2 StableJun 7, 2024Changed1Other11.3.1 StableMay 29, 2024New1Changed11.3.1.pre RCMay 29, 2024No notes published1.2.3 youStableJan 16, 2024Breaking1New3Changed1Fixed5Other91.2.2 StableFeb 24, 2023No changes listed1.2.1 StableFeb 24, 2023No changes listed1.2.0 StableJan 23, 2023No changes listed1.1.10 StableMar 22, 2022No changes listed1.1.9 StableJun 5, 2021No changes listed1.1.8 StableJan 20, 2021No changes listed1.1.7 StableAug 8, 2020No changes listed1.1.6 StableFeb 10, 2020No changes listed1.1.6.pre1 RCJan 26, 2020No changes listed1.1.5 StableMar 11, 2019No changes listed