GradleTest 4.1.0 is out with (preliminary) support for testing Gradle 9.0. See: https://gradletest.ysb33r.org NOTE: Out-of-the-box it will remove 9.x from the test sets if you are not building your plugin with JDK17+. There is a workaround for that, but it currently requires a bit of scaffolding. A future release will take care of it by using Jvm Toolchains and remove the scaffolding.