db2 9.7 fix pack upgrade

Hi
DB2 9.7 FP 4 / Win 2008

for the last two years we have been running on FP4 and I need to upgrade to latest FP8. Application wise, nothing has changed, and will not change soon.

I have been telling to my manager (not a techincal guy) to upgrade the latest FP for the last two years. But his argument is that the system is working fine without any issues and why do we need to upgrade?

Whats your advise please?

Thanks.