This worked for me after a bit of faffing:
yum install yum-fastestmirror
yum clean all
yum install preupgrade
rm -rf /var/cache/yum/preupgrade*
yum clean all
yum install preupgrade
rm -rf /var/cache/yum/preupgrade*
Run the final line to blow away the upgrade cache if you run into any problems and need to try again.
UPDATE: Oh and you might need to run gparted to resize your /boot partition. It needs to be at least 300mb!!
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