Hi,
Version 4.0 of Geb has been released and is available from Maven Central.
The main change in this new major version is that integrations with test frameworks were extracted into GebTestManager which helped to remove duplication and will make integrations with test frameworks easier in the future. Introduction of GebTestManager required base test classes that Geb ships with to be changed in a backwards incompatible way - you should not be affected by that unless you overrode methods defined on these classes. All this was prompted by the introduction of support for JUnit 5 which proved to be enough stimulus to improve code reuse in that area.
Thanks,
Marcin