1.13.0
The 1.13.0 release of GeoScript is built on Grooovy 2.5.6, GeoTools 20.1, and the Java Topology Suite 1.60.0 and requires Java 8.
https://github.com/geoscript/geoscript-groovy/blob/master/doc/releases.rst
http://geoscript.github.io/geoscript-groovy/api/1.13.0/index.html