It looks like you are using OpenAFS packages built for a specific kernel - in this case the 5.5 kernel-2.6.18-194.26.1.el5. My guess would be that in updating to 5.6, yum has automatically removed that older kernel. You need to get kmod-openafs packages that match the version of your currently running kernel. Where did you get these packages as they are not a part of CentOS? Thank you, Ned. Here is what I ended up doing.. Thanks to Hyper V i could easily rollback to 5.5. Downloaded kernel-2.6.18-194.26.1.el5.i686.rpm, manually installed it and after that yum update worked without any issues. Thank you for pointing me into the right direction. Asya -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20110413/48bf7d2a/attachment-0005.html>