How to update from rpm 4.4 to rpm 5.0

[JD]

Dear list,
My current system has

rpm-4.4.2.2-2
rpm-libs-4.4.2.2-2
rpm-python-4.4.2.2-2

I want to update to

rpm-perl-5.0-0.2.0
rpm-libs-5.0-0.2.0
rpm-build-5.0-0.2.0
rpm-5.0-0.2.0
rpm-python-5.0-0.2.0
The 5.0 builds are made for my version of fedora.

How can I update to the new 5.0 stuff safely, so that
I am not left without an rpm tool.
The dependencies are so many, I am not sure how I can
update and not break the dependents.