[CentOS] Newer MySQL in centos-plus?

Hi List,

I'm noticing that the CentOS-plus repo for 4.6 has MySQL 5.0.54 in it,  
but the CentOS 5.1 repo does not have a newer rpm, leaving the  
"newest" easily-available version as the vendor-provided mysql 5.0.22.

Is there a reason for this? We're wanting to try a newer MySQL under  
CentOS 5.1 -- do any of the standard repos include such an RPM?

Thanks!
-Jeff