fatal error upgrading kernel w/up2date

[ARIKKAT UNNIKRISHNAN <arun sfsu edu>]

Hello,
Any advice as to how to approach the problem below would be
appreciated...

In response to the RHSA-2002:262-7, I tried updating my kernel to
2.4.18-18.7.x using GUI up2date but encountered a problem.

When I try and install the kernel updates I get the following error
message:

There was a fatal RPM error.  The message was:
Failed installing packages:
('installing package kernel-smp-2.4.18-18.7.x needs 3Mb on the /boot
filesystem', (9, '/boot', 2622464))

But when I type df I'm told that there is enough space on /boot:

$df -h
Filesystem       Size   Used   Avail   Use%   Mounted on
/dev/sda8        494M   152M    316M    33%   /
/dev/sda3         23M    15M    7.2M    67%   /boot
none             251M      0    250M    0%    /dev/shm
/dev/sda9	  61M   4.2M	 53M	8%    /tmp
/dev/sda5	  40G	1.9G	 36G	5%    /usr
/dev/sda6	  24G	1.9G	 20G	9%    /var
/dev/sda2	1011M    59M	901M	7%    /home

Can anyone explain how I may solve this problem?

Thanks in advance for any help/ideas.

Regards

--AAU