Now **this** is a tricky one! `${project.version}` or `${project.parent.version}` will not work here, since I guess the Maven release plugin _won't_ identify this as an external dependency, and won't give you the chance to specify which "main" version we need.

The only thing I could imagine would work here would be `${project.parent.parent.version}` (i.e. the version of jclouds-project), but I'm not sure if Maven handles that. We'll need to run `mvn release:prepare` and examine the output to verify, I think...