There’s no automated method at this point. Generally, it’s not the best thing to be on the latest PIX code unless you require a new feature that the code supports. Often with new features, new problems exist. Stay a couple releases back and if it’s not broken, don’t fix it. If there is a security advisory about the code you are running, you should know about that. They’re all posted here: http://www.cisco.com/warp/public/707/advisory.html#advisories
