Problem With yum update

[Troy Bull]

I just tried to do yum update on my 2 fedora 7 boxes, and I get the 
following error:

Resolving Dependencies
--> Running transaction check
---> Package system-config-printer.i386 0:0.7.63.2-2.fc7 set to be updated
---> Package system-config-printer-libs.i386 0:0.7.63.2-2.fc7 set to be 
updated
filelists.sqlite.bz2      100% |=========================| 1.0 MB    
00:01    
---> Package kernel.i686 0:2.6.21-1.3228.fc7 set to be updated
---> Package redhat-menus.noarch 0:8.9.10-3.fc7 set to be updated
---> Package kernel-headers.i386 0:2.6.21-1.3228.fc7 set to be updated
--> Processing Dependency: mkinitrd >= 6.0.9-7.1 for package: kernel
--> Finished Dependency Resolution
Error: Missing Dependency: mkinitrd >= 6.0.9-7.1 is needed by package kernel
[root at source ~]#

I tried

yum install mkinitrd and it said nothing to do, any pointers??

thanks
troy