Old kernel version in use even after upgrade. Please suggest.

[unix syzadmin]

Hi,

We recently upgraded a server running RHEL AS3 Update3 to Update5.
We have used yum to update.
I could confirm the upgrade by looking at the /etc/redhat-release file.

# more /etc/redhat-release
Red Hat Enterprise Linux AS release 3 (Taroon Update 5)

However the kernel version shown for the uname -a command looks to be still
old.

# uname -a
Linux bngddia6 2.4.21-20.EL #1 SMP Wed Aug 18 20:30:22 EDT 2004 ia64 ia64
ia64 GNU/Linux

# rpm -qa | grep kernel
kernel-2.4.21-20.EL
kernel-2.4.21-32.EL
kernel-utils-2.4-8.37.12
kernel-source-2.4.21-32.EL
kernel-source-2.4.21-20.EL


How do I change this.  Please suggest.

Thanks & Regards