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Keeping the freeBSD installation up-to-date is simple.

# portsnap fetch
# portsnap update
# portmanager -u -l<span id="more-651"></span>

portsnap – Approximately every hour, a snapshot of the ports tree is generated, repackaged, and cryptographically signed. portsnap gets this information to see which ports you have out of date so you can easily update them.

portsmanager – updates ports in the correct order based on their dependencies.

Now on to the binary security updates:

# freebsd-update fetch

# freebsd-update install

# freebsd-update  rollback   (in case you need to rollback)

Now just check the kernal version
[php]$ uname -a 

reboot to apply changes

shutdown -r now

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Source: http://www.cyberciti.biz/tips/howto-keep-freebsd-system-upto-date.html