sec.update 7.2-RELEASE-p6 not showing up

[n dhert]

FreeBSD7.2 system with Generic kernel.
There was a security update patch release two days ago: 7.2-RELEASE-p6
Fetched and installed it with # freebsd-update install
The files mentionned in the mail that would be replaced by the patch, are
replaced (date has changed)
Yet, after a reboot (shutdown -r), # uname -a
still shows the previous -pX version and the date that this previous one was
installed ...
Why and how to correct that ?