In the yum priorities page on the wiki Akemi Yagi suggests http://wiki.centos.org/PackageManagement/Yum/Priorities [base], [addons], [updates], [extras] ... priority=1 [centosplus],[contrib] ... priority=2 Third Party Repos ... priority=N (where N is > 10 and based on your preference) If you have rpmforge, kbs, epel all set up at 10 then wouldn't those also potentially overwrite each other if the same package exists in all of them? Who has got several 3rd party repos and what are your yum priority for those? Regards, Vandaman.