If you are not having any problems with your setup, I advise against it.
BIOS updates themselves have no direct bearing on performance improvement to a system. A BIOS is not a "Driver"
What they do is prepare configurations and settings that will allow for hardware settings and upgrades that may in turn realize a performance improvement. So in short, if you are not upgrading hardware and you will need the new BIOS revision to detect it properly, (like a CPU) or have a specific current problem that the BIOS update is going to fix, (and the revision notes will tell you if a bug has been fixed) it is pointless to update it.
Some people though just like the happiness of knowing they have everything up to date and current. But, just be sure you are comfortable doing it, because if you do screw it up, you could indeed be left with a dead motherboard. Its your call!