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JRuby version 9.4.8.0 is now available
Change effective on 03 July 2024
JRuby v9.4.8.0 is now available on Heroku. To run
your app using this version of Ruby, add the following ruby
directive to your Gemfile:
ruby "3.1.4", engine: "jruby", engine_version: "9.4.8.0"
The JRuby release notes can be found on the JRuby website.