rpm depency hell :/
-You can install apt4rpm (search LQ for more info)
-install the rpm's with rpm -uvh --nodeps (pretty dangerous, doens't check deps)
-Or simply leave KDE the way it is.
If you don't have probs with KDE now, and there are no major changes in the new version, I'd say don't bother updating.
Updating minor release versions is pretty useless anyway IMHO.