you can probably change your repositories for your package manager to search for FC5 software, rather than FC4, as it is set up now. read
this page, specifically 2.2 and 7.*.
use YUM to view your current repositories... somewhere in the link(s) that it shows, it will have a '4' representing FC4.. most likely all youll have to do is change that to a '5' wherever you see '4'. save the respositories, update package list, and upgrade system. (note this is my assumption, i dont use yum or FC so im not guaranteeing anything)
heres what a quick search brought up:
http://www.brandonhutchinson.com/Upg..._with_yum.html if that doesnt work or you dont want to try that, search somewhere else for upgrading fc4 to fc5.. good luck!
