I had a look around, and I couldn't find a maven plugin allowing to update a property in the pom...
The maven-version-plugin has two pending PRs to add this feature, though:

• https://github.com/mojohaus/versions-maven-plugin/pull/119
• https://github.com/mojohaus/versions-maven-plugin/pull/124

I guess we could do some simple XPath-based substitution, but I'm not really confortable with adding exotic dependencies to our build scripts...