We’ve jumped to Ruby 3.4 compatibility and Java 21 minimum to bring you the best Ruby on JVM experience possible. We are confident this is the most compatible and stable major release we’ve ever had. Security
jruby-openssl has been updated to 0.15.4, which re-enables hostname verification by default. This addresses CVE-2025-46551 and GHSA-72qj-48g4-5xgx.