This page describes JMRI releases. Briefly, we have three kinds:
For more information on the (intended) release schedule, see the current list of milestones and the development roadmap.
If you've never installed a version of this program before, please read the installation guide (on the left) for your computer type and layout hardware. They will show you how to install the things that are needed before the program will run. These additional preliminary steps are one-time only and not necessary when updating. If you've previously installed a working version of the program, you only need to download and install one of the files listed below to update.
Installation guides: Windows, macOS, Linux
See also the page of layout connections.
On June 20, 2025 production release 5.12 was made available.
Release 5.12 is the current "production" release, recommended for first-time users. Please see the release note for additional information.
Test release 5.13.1 was made available on June 30, 2025.
JMRI 5.13.1 is the next release of the current development series, containing the latest and greatest JMRI updates.
The series is working toward the JMRI 5.14 production release, probably in December 2025.
For more information, including the links to download a copy, please see the release note. Release 5.12 is the current "production" release, recommended for first-time users.
Download:
If you're looking to download Rodney Black's
CATS
application, see the
CATS download page.
Release 4.26 is recommended for JMRI users with computers that can only run Java 8. Please see the release note for download and install information.
Production release 4.26 was made available on December 22, 2021.
Release 3.10.1 is recommended for JMRI users with computers that can only run Java 1.6. Please see the release note for download and install information.
Production release 3.10.1 was made available on January 11, 2015.
Release 2.14.1 is recommended for JMRI users with computers that can only run Java 1.5. Please see the release note for download and install information.
Production release 2.14.1 was made available on July 15, 2012.
As the program develops, we also produce test releases. You may want to try these, as new features will show up in them first. They are announced in the JMRI users Groups.io group.
The most current test release is JMRI 5.13.1. More information on it, including the links to download a copy, can be found in the release note.
For more information on the rough development schedule, please see the JMRI road map (which is only occasionally updated).
The Crandic Automated Traffic System (CATS) is a JMRI-based application by Rodney Black for controlling and operating a model railroad. There's more information on the CATS website.