You could always download an ISO and burn a newer version of RHL. Or you could try out one of the many other versions out there. I always use Tucows to get my distros. They are hosted by Exodus, so it's pretty durned fast.
You could also use a command line RPM and "freshen" the packages, but you would have to be quite patient and I am not sure how much of it would actually be updated with this method.