Could not find update match for kernel

[esolberg 0]

I'm running Centos 2.6.18-8.1.15.el5, dedicated server

I got a security notice from my ISP that I needed to run 'yum update kernel' to fix a security hole. Yum is saying "Could not find update match for kernel".

 

Any idea on what should be done here?

 

Thanks.