That's more a Maven question. You can suscribe <[EMAIL PROTECTED]>to the Maven mailing list<users@maven.apache.org>and ask that, or search in archive <http://mail-archives.apache.org/mod_mbox/maven-users> for a possible answer.
I'm interested in that answer because it would be a nice way to manage version dependency. I personally haven't found a way to do that automatically. I make a way creating a profile in the settings.xml of maven. It's a version-profile where everyone in our team writes their last version number. When we need a dependency from some of our projects we write in the pom ${ someDependency.version} and that property contains the last value written in settings.xml. That work for us until we realized that Continuum 1.0.2 (dunno if 1.0.3 does) didn't read the profiles from Maven's settings.xml. It doesn't work for outside project either (well, it could work but you'll have to write every single last version from every outside project). If you find a better way wich works with Continuum, let me know :D