JRuby 10.1.2.0 is released! JRuby 10.1 is our edge line, with more aggressive performance work and refactorings. This release improves perf of Ruby classes that extend Java, startup time on MacOS, and includes many stdlib updates.
www.jruby.org/2026/09/21/j...
www.jruby.org/2026/09/21/j...
JRuby 10.1.2.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.1.2.0.
www.jruby.org
September 22, 2026 at 12:05 AM
JRuby 10.1.2.0 is released! JRuby 10.1 is our edge line, with more aggressive performance work and refactorings. This release improves perf of Ruby classes that extend Java, startup time on MacOS, and includes many stdlib updates.
www.jruby.org/2026/09/21/j...
www.jruby.org/2026/09/21/j...
JRuby 10.0.7.0 is released! JRuby 10.0 is our stable line, receiving only bug and security fixes and critical performance improvements. This release tidies up another round of compatibility issues and updates a few standard libraries.
www.jruby.org/2026/09/21/j...
www.jruby.org/2026/09/21/j...
JRuby 10.0.7.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.0.7.0.
www.jruby.org
September 21, 2026 at 11:41 PM
JRuby 10.0.7.0 is released! JRuby 10.0 is our stable line, receiving only bug and security fixes and critical performance improvements. This release tidies up another round of compatibility issues and updates a few standard libraries.
www.jruby.org/2026/09/21/j...
www.jruby.org/2026/09/21/j...
Hello JRubyists! Anyone planning to be at tiny ruby #{conf} 2026 presented by @helsinkiruby.fi next week? We'd love to help you spread the word about JRuby to the Helsinki Ruby community! Get in touch if we can help you in any way!
September 21, 2026 at 5:56 PM
Hello JRubyists! Anyone planning to be at tiny ruby #{conf} 2026 presented by @helsinkiruby.fi next week? We'd love to help you spread the word about JRuby to the Helsinki Ruby community! Get in touch if we can help you in any way!
JRuby 10.1.1.0 is released, with a bunch of compat fixes, more performance work, and several third-party CVEs resolved. JRuby 10.1 is our active development branch, with 10.0 being stable. Upgrading is recommended if you want the latest and greatest!
www.jruby.org/2026/07/22/j...
www.jruby.org/2026/07/22/j...
JRuby 10.1.1.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.1.1.0.
www.jruby.org
July 22, 2026 at 6:33 PM
JRuby 10.1.1.0 is released, with a bunch of compat fixes, more performance work, and several third-party CVEs resolved. JRuby 10.1 is our active development branch, with 10.0 being stable. Upgrading is recommended if you want the latest and greatest!
www.jruby.org/2026/07/22/j...
www.jruby.org/2026/07/22/j...
Our friends over at @fastruby.io have posted a nice compatibility matrix for JRuby versions, covering Ruby and Rails compatibility.
Check it out to learn how the versions line up or if you haven't already discovered how JRuby can help you run Ruby and Rails better!
www.fastruby.io/blog/jruby/r...
Check it out to learn how the versions line up or if you haven't already discovered how JRuby can help you run Ruby and Rails better!
www.fastruby.io/blog/jruby/r...
JRuby & Rails Compatibility Table - FastRuby.io | Rails Upgrade Service
A complete table showing the compatibility between JRuby and Rails across each version, including the Ruby language level and the Java version that each JRuby line requires.
www.fastruby.io
June 26, 2026 at 3:45 PM
Our friends over at @fastruby.io have posted a nice compatibility matrix for JRuby versions, covering Ruby and Rails compatibility.
Check it out to learn how the versions line up or if you haven't already discovered how JRuby can help you run Ruby and Rails better!
www.fastruby.io/blog/jruby/r...
Check it out to learn how the versions line up or if you haven't already discovered how JRuby can help you run Ruby and Rails better!
www.fastruby.io/blog/jruby/r...
JRuby 10.0.6.0 released! Updated jruby-openssl, faster Java interface support, and many other fixes and improvements. JRuby 10.0.x is our LTS version, so upgrading is recommended.
www.jruby.org/2026/06/11/j...
www.jruby.org/2026/06/11/j...
JRuby 10.0.6.0 Released — JRuby.org
The Ruby Programming Language on the JVM
www.jruby.org
June 11, 2026 at 6:07 PM
JRuby 10.0.6.0 released! Updated jruby-openssl, faster Java interface support, and many other fixes and improvements. JRuby 10.0.x is our LTS version, so upgrading is recommended.
www.jruby.org/2026/06/11/j...
www.jruby.org/2026/06/11/j...
JRuby 9.4.15.0 is released! This is the last regularly-scheduled release of JRuby 9.4.x and includes the last set of unreleased 9.4 fixes. Future releases will be done as needed for commercial JRuby users. Contact us if you need long-term JRuby 9.4 support.
www.jruby.org/2026/06/08/j...
www.jruby.org/2026/06/08/j...
JRuby 9.4.15.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 9.4.15.0.
www.jruby.org
June 8, 2026 at 6:40 PM
JRuby 9.4.15.0 is released! This is the last regularly-scheduled release of JRuby 9.4.x and includes the last set of unreleased 9.4 fixes. Future releases will be done as needed for commercial JRuby users. Contact us if you need long-term JRuby 9.4 support.
www.jruby.org/2026/06/08/j...
www.jruby.org/2026/06/08/j...
JRuby 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!
www.jruby.org/2026/04/21/j...
www.jruby.org/2026/04/21/j...
JRuby 10.1.0.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.1.0.0.
www.jruby.org
April 21, 2026 at 2:28 PM
JRuby 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!
www.jruby.org/2026/04/21/j...
www.jruby.org/2026/04/21/j...
JRuby 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!
www.jruby.org/2026/04/06/j...
www.jruby.org/2026/04/06/j...
JRuby 10.0.5.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.0.5.0.
www.jruby.org
April 6, 2026 at 6:59 PM
JRuby 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!
www.jruby.org/2026/04/06/j...
www.jruby.org/2026/04/06/j...
Today 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
github.com/bcrypt-ruby/...
CVE-2026-33306: Integer Overflow Causes Zero Key-Strengthening Iterations at Cost=31 on JRuby
github.com/bcrypt-ruby/...
Integer Overflow Causes Zero Key-Strengthening Iterations at Cost=31 on JRuby
### Impact An integer overflow in the Java BCrypt implementation for JRuby can cause zero iterations in the strengthening loop. Impacted applications must be setting the cost to 31 to see this ...
github.com
March 18, 2026 at 11:48 PM
Today 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
github.com/bcrypt-ruby/...
CVE-2026-33306: Integer Overflow Causes Zero Key-Strengthening Iterations at Cost=31 on JRuby
github.com/bcrypt-ruby/...
JRuby 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!
www.jruby.org/2026/03/04/j...
www.jruby.org/2026/03/04/j...
JRuby 10.0.4.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.0.4.0.
www.jruby.org
March 4, 2026 at 5:23 PM
JRuby 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!
www.jruby.org/2026/03/04/j...
www.jruby.org/2026/03/04/j...
JRuby 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!
www.jruby.org/2026/02/02/j...
www.jruby.org/2026/02/02/j...
JRuby 10.0.3.0 Released — JRuby.org
www.jruby.org
February 3, 2026 at 1:40 AM
JRuby 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!
www.jruby.org/2026/02/02/j...
www.jruby.org/2026/02/02/j...
Reposted by The JRuby Project
New post: Warbled Sidekiq: Zero-install Executable for JVM
In my previous post, I showed how to use Warbler to package a simple tool as an executable jar. This post will demonstrate how to “warble” a larger project: the Sidekiq background job server!
buff.ly/ZEasNiu
In my previous post, I showed how to use Warbler to package a simple tool as an executable jar. This post will demonstrate how to “warble” a larger project: the Sidekiq background job server!
buff.ly/ZEasNiu
Warbled Sidekiq: Zero-install Executable for JVM
In my previous post, I showed how to use Warbler to package a simple image-processing tool as an executable jar. This post will demonstrate how to “warble” a larger project: the Sidekiq background…
blog.headius.com
October 23, 2025 at 5:01 PM
New post: Warbled Sidekiq: Zero-install Executable for JVM
In my previous post, I showed how to use Warbler to package a simple tool as an executable jar. This post will demonstrate how to “warble” a larger project: the Sidekiq background job server!
buff.ly/ZEasNiu
In my previous post, I showed how to use Warbler to package a simple tool as an executable jar. This post will demonstrate how to “warble” a larger project: the Sidekiq background job server!
buff.ly/ZEasNiu
Reposted by The JRuby Project
New post: "Packaging Ruby Apps with Warbler: Executable JAR Files"
Warbler is the JRuby ecosystem’s tool for packaging up Ruby apps with all dependencies in a single deployable file. We’ve just released an update, so let’s use Warbler to create all-in-one packaged Ruby apps!
buff.ly/ZdXcCop
Warbler is the JRuby ecosystem’s tool for packaging up Ruby apps with all dependencies in a single deployable file. We’ve just released an update, so let’s use Warbler to create all-in-one packaged Ruby apps!
buff.ly/ZdXcCop
Packaging Ruby Apps with Warbler: Executable JAR Files
Warbler is the JRuby ecosystem’s tool for packaging up Ruby apps with all dependencies in a single deployable file. We’ve just released an update, so let’s explore how to use Warbler to create…
blog.headius.com
October 21, 2025 at 5:42 PM
New post: "Packaging Ruby Apps with Warbler: Executable JAR Files"
Warbler is the JRuby ecosystem’s tool for packaging up Ruby apps with all dependencies in a single deployable file. We’ve just released an update, so let’s use Warbler to create all-in-one packaged Ruby apps!
buff.ly/ZdXcCop
Warbler is the JRuby ecosystem’s tool for packaging up Ruby apps with all dependencies in a single deployable file. We’ve just released an update, so let’s use Warbler to create all-in-one packaged Ruby apps!
buff.ly/ZdXcCop
Warbler 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!
rubygems.org/gems/warbler...
rubygems.org/gems/warbler...
warbler | RubyGems.org | your community gem host
Warbler is a gem to make a Java jar or war file out of any Ruby, Rails, or Rack application. Warbler provides a minimal, flexible, Ruby-like way to bundle up all of your application files for…
rubygems.org
October 16, 2025 at 10:05 AM
Warbler 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!
rubygems.org/gems/warbler...
rubygems.org/gems/warbler...
We 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!
October 3, 2025 at 10:05 AM
We 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!
Reposted by The JRuby Project
At the end of my post on JRuby and JDK 25 startup time features, I teased a bit of the unreleased improvements from Project Leyden. It turns out the latest commits improve startup time even more, so it seems worth posting a quick follow-up!
www.reddit.com/r/ruby/comme...
www.reddit.com/r/ruby/comme...
From the ruby community on Reddit: JRuby and Leyden: Even Better Startup
Posted by headius - 1 vote and 0 comments
www.reddit.com
September 26, 2025 at 4:38 PM
At the end of my post on JRuby and JDK 25 startup time features, I teased a bit of the unreleased improvements from Project Leyden. It turns out the latest commits improve startup time even more, so it seems worth posting a quick follow-up!
www.reddit.com/r/ruby/comme...
www.reddit.com/r/ruby/comme...
Reposted by The JRuby Project
New post: JRuby and JDK 25: Startup Time with AOTCache
Let's take a look at JRuby's startup time journey, all the way up to using JDK 25's AOTCache and Project Leyden features coming to a JDK near you soon.
blog.headius.com/2025/09/jrub...
Let's take a look at JRuby's startup time journey, all the way up to using JDK 25's AOTCache and Project Leyden features coming to a JDK near you soon.
blog.headius.com/2025/09/jrub...
JRuby and JDK 25: Startup Time with AOTCache
JDK 25 is the newest LTS release since JDK 21, and it ships with a gaggle of amazing VM-level features. This post will cover one of the most important improvements for command-line ecosystems like…
blog.headius.com
September 24, 2025 at 5:34 PM
New post: JRuby and JDK 25: Startup Time with AOTCache
Let's take a look at JRuby's startup time journey, all the way up to using JDK 25's AOTCache and Project Leyden features coming to a JDK near you soon.
blog.headius.com/2025/09/jrub...
Let's take a look at JRuby's startup time journey, all the way up to using JDK 25's AOTCache and Project Leyden features coming to a JDK near you soon.
blog.headius.com/2025/09/jrub...
JRuby 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!
www.jruby.org/2025/08/28/j...
www.jruby.org/2025/08/28/j...
JRuby 9.4.14.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 9.4.14.0.
www.jruby.org
August 28, 2025 at 9:06 PM
JRuby 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!
www.jruby.org/2025/08/28/j...
www.jruby.org/2025/08/28/j...
JRuby 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!
www.jruby.org/2025/08/07/j...
www.jruby.org/2025/08/07/j...
JRuby 10.0.2.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.0.2.0.
www.jruby.org
August 7, 2025 at 8:41 PM
JRuby 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!
www.jruby.org/2025/08/07/j...
www.jruby.org/2025/08/07/j...
We 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!
www.jruby.org/2025/07/17/j...
www.jruby.org/2025/07/17/j...
JRuby 10.0.1.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 10.0.1.0.
www.jruby.org
July 17, 2025 at 7:04 PM
We 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!
www.jruby.org/2025/07/17/j...
www.jruby.org/2025/07/17/j...
We 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!
github.com/jruby/warble...
github.com/jruby/warble...
Updating and releasing with modern libs · Issue #558 · jruby/warbler
It's been too long since this library had an update and release. This issue will track the tasks necessary. I cloned and ran tests locally with JRuby 10, and a number of areas need improvement: Lot...
github.com
June 25, 2025 at 2:44 AM
We 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!
github.com/jruby/warble...
github.com/jruby/warble...
FYI: 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 github.com/docker-libra...
This will take effect with releases 9.4.14.0 and 10.0.1.0, whenever they happen.
See github.com/docker-libra...
Update Ubuntu 2025-06-01 by ROCKsBot · Pull Request #19167 · docker-library/official-images
Update Ubuntu to the latest published OCI tarballs as of 2025-06-01.
github.com
June 17, 2025 at 7:29 PM
FYI: 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 github.com/docker-libra...
This will take effect with releases 9.4.14.0 and 10.0.1.0, whenever they happen.
See github.com/docker-libra...
JRuby 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!
www.jruby.org/2025/06/10/j...
www.jruby.org/2025/06/10/j...
JRuby 9.4.13.0 Released — JRuby.org
The JRuby community is pleased to announce the release of JRuby 9.4.13.0.
www.jruby.org
June 10, 2025 at 6:48 PM
JRuby 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!
www.jruby.org/2025/06/10/j...
www.jruby.org/2025/06/10/j...
Reposted by The JRuby Project
this week on the unikernel application spotlight we check out @jrubyproject.bsky.social
www.youtube.com/watch?v=72wl... - real threads && jvm interop - congrats on 10.x release and 24 yrs! @headius.bsky.social
www.youtube.com/watch?v=72wl... - real threads && jvm interop - congrats on 10.x release and 24 yrs! @headius.bsky.social
[Unikernel Application Spotlight] JRuby
YouTube video by nanovms
www.youtube.com
June 8, 2025 at 4:39 PM
this week on the unikernel application spotlight we check out @jrubyproject.bsky.social
www.youtube.com/watch?v=72wl... - real threads && jvm interop - congrats on 10.x release and 24 yrs! @headius.bsky.social
www.youtube.com/watch?v=72wl... - real threads && jvm interop - congrats on 10.x release and 24 yrs! @headius.bsky.social