The JRuby community is pleased to announce the release of JRuby 9.4.12.0. - Homepage: https://www.jruby.org/ - Download: https://www.jruby.org/download JRuby 9.4.12.x targets Ruby 3.1 compatibility. Thank you to our contributors this release, you help keep JRuby moving forward! Critical Fixes - Added additional locking to the new Class#subclasses implementation to fix a concurrent modification error. #8602, #8603 Standard Library - jar-dependencies upgraded to 0.5.4 to fix an issue parsing Maven output on Java versions 9 and higher. #8606, [#8515] 4 Issues and PRs resolved for 9.4.12.0 #8602 ConcurrentModificationException in subclasses map #8603 Ensure subclass set prevents concurrent modification #8606 No such file or directory snakeyaml-engine-2.9.jar in JRuby 9.4.11.0 #8615 Use jar-dependencies 0.5.4 -- blog: http://blog.enebo.com twitter: tom_enebo mail: tom.enebo@gmail.com