Why only Berkely libdb version 4.5 in Opensuse?

Mandriva 2009.1 has libdb 4.6 and 2010 is up to libdb 4.7. Does anyone know why Opensuse 11.2 is still on 4.5?

This version difference has caused a problem with my spamassassin databases, which have been finely tuned over a long period of time.