On most systems, using Fedora’s preupgrade package is the most reliable way to update to the next Fedora release. However, this isn’t the case with Slicehost and Rackspace Cloud Servers.

Here are the steps for an upgrade from Fedora 13 to Fedora 14 via yum:

yum -y upgrade
wget http://mirror.rackspace.com/fedora/releases/14/Fedora/x86_64/os/Packages/fedora-release-14-1.noarch.rpm
rpm -Uvh fedora-release-14-1.noarch.rpm
yum -y install yum
yum -y upgrade

If you happen to be upgrading a 32-bit instance on Slicehost, simply replace x86_64 with i386 in the url shown above.