I have the Groovy and Groovy Postbuild plugins installed in Jenkins (1.554) and have it set to automatically install Groovy 2.2.1 when needed. 

After having a problem with a constructor signature I dug a little deeper and round that Jenkins is actually using 1.8.9 by running this through the groovysh CLI. 

```
groovy> import org.codehaus.groovy.runtime.InvokerHelper
groovy> println InvokerHelper.version

```

It appears that the groovy post build plugin is also using 1.8.9 based on the error message I get when I try to run my script.

How can I update this? I have already set the groovy plugin to use 2.2.1. Thanks!