Welcome to JRuby!https://bsky.app/profile/jrubyproject.bsky.socialhttps://bsky.app/profile/jrubyproject.bsky.social/post/3mjz6y37jv42sJRuby 10.1 is released! We've caught up with CRuby 4.0 after less than four months, and pushed a bunch of new optimizations: smaller objects, smaller numerics, and groundwork for many more. We'll maintain 10.0 as our stable line, but do try 10.1 yourself! https://www.jruby.org/2026/04/21/jruby-10-1-0-0.html21 Apr 2026 14:28 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3mjz6y37jv42shttps://bsky.app/profile/jrubyproject.bsky.social/post/3mitx4x3xli2nJRuby 10.0.5.0 is released! This round we fixed some memory leaks when embedding multiple JRuby instances, a few pesky Windows bugs, and several Ruby compatibility blockers. Enjoy! https://www.jruby.org/2026/04/06/jruby-10-0-5-006 Apr 2026 18:59 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3mitx4x3xli2nhttps://bsky.app/profile/jrubyproject.bsky.social/post/3mheoevnfzm2xToday we were informed of a low-severity vulnerability in the bcrypt-ruby gem. We worked with the maintainers to arrange a fix. Upgrading is recommended. CVE-2026-33306: Integer Overflow Causes Zero Key-Strengthening Iterations at Cost=31 on JRuby https://github.com/bcrypt-ruby/bcrypt-ruby/security/advisories/GHSA-f27w-vcwj-c95418 Mar 2026 23:48 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3mheoevnfzm2xhttps://bsky.app/profile/jrubyproject.bsky.social/post/3mgasdihydi2eJRuby 10.0.4.0 is released! A month after 10.0.3.0, we've addressed lots of one-off issues, a few memory and thread-safety fixes, and general compatibility and stabilization work. Enjoy! https://www.jruby.org/2026/03/04/jruby-10-0-4-0.html04 Mar 2026 17:23 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3mgasdihydi2ehttps://bsky.app/profile/jrubyproject.bsky.social/post/3mdwa5x55ss2dJRuby 10.0.3.0 is released! Over 80 issues and pull requests and 13 external contributors combined to help further stabilize our 10.0 series! There's lots of compatibility fixes, a few performance enhancements, and a number of library updates. Upgrade is recommended! https://www.jruby.org/2026/02/02/jruby-10-0-3-003 Feb 2026 01:40 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3mdwa5x55ss2dhttps://bsky.app/profile/jrubyproject.bsky.social/post/3m3cj25gtqh2zWarbler 2.1.0 has been released! Warbler allows you to package JRuby applications (with obfuscation of code) as a single binary, either a .jar file you can run directly or a .war file you can deploy to any Java application server. Blog post coming! https://rubygems.org/gems/warbler/versions/2.1.016 Oct 2025 10:05 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3m3cj25gtqh2zhttps://bsky.app/profile/jrubyproject.bsky.social/post/3m2bsy7ffb62fWe have published Docker images for JRuby 9.4 and JRuby 10 on JDK 25! The -dev images are also updated to latest commits. Give them a try and let us know if there's any issues!03 Oct 2025 10:05 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3m2bsy7ffb62fhttps://bsky.app/profile/jrubyproject.bsky.social/post/3lxih5sy4ra2eJRuby 9.4.14.0 is released! We've updated a bunch of the standard library (including "cgi" to fix a couple of CVEs), fixed a few memory leaks and a bunch of compatibility issues, and generally stabilized things. Upgrading is recommended! https://www.jruby.org/2025/08/28/jruby-9-4-14-028 Aug 2025 21:06 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lxih5sy4ra2ehttps://bsky.app/profile/jrubyproject.bsky.social/post/3lvtlxkcpsv2qJRuby 10.0.2.0 is released! This is a small release to fix an ArgumentError regression in JRuby 10.0.1.0 plus a few other small fixes. Recommended upgrade for all, but let us know if you run into any issues! https://www.jruby.org/2025/08/07/jruby-10-0-2-0.html07 Aug 2025 20:41 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lvtlxkcpsv2qhttps://bsky.app/profile/jrubyproject.bsky.social/post/3lu6mqbgbcy2zWe have just released JRuby 10.0.1.0, our first update to JRuby 10! There's dozens of patches including full support (finally) for Zeitwerk and a bunch of Ruby 3.4 language fixes. Upgrade today and let us know how it goes! https://www.jruby.org/2025/07/17/jruby-10-0-1-017 Jul 2025 19:04 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lu6mqbgbcy2zhttps://bsky.app/profile/jrubyproject.bsky.social/post/3lsflqtrbiq27We have released jruby-maven-plugins 3.0.6, which updates JRuby to 9.4.13.0 along with several other improvements. But more exciting: Warbler is BACK! We've updated it for latest JRuby and dependencies and it's running green in CI. Time for feature requests! https://github.com/jruby/warbler/issues/558#issuecomment-300256081225 Jun 2025 02:44 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lsflqtrbiq27https://bsky.app/profile/jrubyproject.bsky.social/post/3lrta6qgxk427FYI: now that Ubuntu 20.04 is EOL, future releases of the JRuby Docker image will be based on Ubuntu 22.04. This will take effect with releases 9.4.14.0 and 10.0.1.0, whenever they happen. See https://github.com/docker-library/official-images/pull/1916717 Jun 2025 19:29 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lrta6qgxk427https://bsky.app/profile/jrubyproject.bsky.social/post/3lrbkmavhzh2pJRuby 9.4.13.0 is released! We have fixed several user issues, including a slow leak in Java interface implementation, a possible deadlock between JIT and main threads, and backported launcher improvements from JRuby 10! https://www.jruby.org/2025/06/10/jruby-9-4-13-0.html10 Jun 2025 18:48 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lrbkmavhzh2phttps://bsky.app/profile/jrubyproject.bsky.social/post/3lolurlze3p2sSecurity advisory: We have released jruby-openssl gem 0.15.4, jruby 10.0.0.1, and jruby 9.4.12.1 to address CVE-2025-46551, disabled hostname verification by default. We recommend that all users upgrade! https://www.cve.org/CVERecord?id=CVE-2025-46551 https://www.jruby.org/2025/05/07/jruby-10-0-0-1 https://www.jruby.org/2025/05/07/jruby-9-4-12-107 May 2025 17:01 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lolurlze3p2shttps://bsky.app/profile/jrubyproject.bsky.social/post/3lmskrimj7u2uIt's finally here! JRuby 10 has been released with support for Ruby 3.4 (including 3.2 and 3.3 updates as well). Minimum Java version has been bumped up to Java 21, allowing us to support modern JVM features. Check out the release notes and start migrating today! https://www.jruby.org/2025/04/14/jruby-10-0-0-014 Apr 2025 22:00 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lmskrimj7u2uhttps://bsky.app/profile/jrubyproject.bsky.social/post/3lkbupzrq4l2sJRuby 10 HEAD builds are now live in GitHub Actions setup-ruby and for any local Ruby installers that depend on jruby-dev-builder's jruby-head packages! Fingers crossed it doesn't cause too many problems, but let us know right away if something goes awry!13 Mar 2025 19:53 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lkbupzrq4l2shttps://bsky.app/profile/jrubyproject.bsky.social/post/3ljiz55onxn2mIt's almost time! JRuby 10 is approaching release, and toward that end we will be switching JRuby master from the 9.4 line to the 10.0 line this week. The "jruby-head" build from GHA "setup-ruby" action will remain 9.4 for now, but it's time for you to start testing with JRuby 10!03 Mar 2025 22:35 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3ljiz55onxn2mhttps://bsky.app/profile/jrubyproject.bsky.social/post/3lhwm2maiaj2hJRuby 9.4.12.0 has been released with two important fixes: a thread-safety patch for recent Class#subclasses logic and an update for jar-dependencies to fix issues parsing Maven output on Java 9+. Let us know if you run into any new issues! https://buff.ly/4hQOCSh11 Feb 2025 21:28 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lhwm2maiaj2hhttps://bsky.app/profile/jrubyproject.bsky.social/post/3lgvtckm4by2gJRuby 9.4.11.0 is released with two critical fixes for bugs in 9.4.10.0 and a handful of stdlib upgrades. We recommend all users update to 9.4.11.0 and skip the 9.4.10.0 release. Let us know if you have issues! https://buff.ly/4aC0rcS29 Jan 2025 20:40 +0000at://did:plc:flnlyr7o36lkbtdyyfffo6sa/app.bsky.feed.post/3lgvtckm4by2g