I have recently installed RH7.  Everything went [seemingly] smoothly.

Today, I tried to update a package.  I got the message:

only packages with major numbers <= 3 are supported by this version of RPM

So, I did a: rpm -qi rpm

Name        : rpm                          Relocations: (not relocateable)
Version     : 3.0.4                             Vendor: Red Hat, Inc.
Release     : 0.48                          Build Date: Wed 01 Mar 2000 02:25:11 PM CST
Install date: Wed 14 Feb 2001 12:08:15 PM CST      Build Host: porky.devel.redhat.com
Group       : System Environment/Base       Source RPM: rpm-3.0.4-0.48.src.rpm
Size        : 2923840                          License: GPL
Packager    : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
Summary     : The Red Hat package management system.

Then I tried to manually upgrade rpm with: rpm -Uvh rpm-4.0-4.i386.rpm

Unfortunately, this also returned:
only packages with major numbers <= 3 are supported by this version of RPM
error: rpm-4.0-4.i386.rpm cannot be installed

I would have thought rpm v4 would have been installed when I installed the operating system, but that appears not to be the case.  So, how do I install the rpm update?

Thanks in advance for your help.