[CentOS] Keep CentOS 5.5 from upgrading?

Thanks,

I'm trying to keep CentOS 5.5 from upgrading to 5.6 because of my issue with the time sync. I thought I had it figured out till today. I have tried google for help but with no luck. Can someone point me to a page or link that will give me a good idea as to how to stop the upgrade but still allow me to update my 5.5 packages?

This is what I tried, that is not working now.

I edited "/etc/yum.repos.d/CentOS-Base.repo" to look as such.

<snip> [base] name=CentOS-5.5 - Base ## name=CentOS-5.5 - Base mirrorlist=http://mirrorlist.centos.org/?release=5.5&arch=$basearch&repo=os #baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 priority=1 </snip>

Brian.