Kernel change after update

I installed TB 2.6.1 on a new appliance and then did a yum -y update to get current. When I boot there are 2 entries in the grub menu, one for Centos (which is the default) and one for Trixbox. The Trixbox entry is an older kernel. Should I just delete that entry in the grub.conf, or did something go wrong in the update? Here is my grub.conf:

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
title CentOS (2.6.18-92.1.18.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-92.1.18.el5 ro root=/dev/md2 acpi=off apm=power-off
initrd /initrd-2.6.18-92.1.18.el5.img
title trixbox (2.6.18-53.1.4.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-53.1.4.el5 ro root=/dev/md2 acpi=off apm=power-off
initrd /initrd-2.6.18-53.1.4.el5.img