RPM upgrade.

I've got a RH 6.2 system and would like to uptdate RPM 3.x to RPM
4.x. Turns out that the rpm's for version 4 were built using version
4 so you can't upgrade it with rpm. I went to ftp.rpm.org and grabbed the
sources for rpm but I'm really not sure if building from the sources will
screw up the current rpm data or what? Has anybody out there done this
upgrade already that could share some tips or pointers?

Don