2.555
Documented Java versions
Jenkins LTS 2.555.1 and newer in the 2.555 release line require Java 21 or Java 25.
The same Java requirement applies to Jenkins controllers, all agent types, CLI clients, and other Jenkins system components.
JDK versions used by jobs and build tools are independent and are not modeled by this entry.
high confidence · verified 2026-07-09 · controller, agent, and CLI runtime