It's up to the 3.6.xxxx series, to be safe I'm updating from 3.6.1002 to 3.6.2002 now. The end goal is 3.6.8012, but since this takes awhile for each update I might go find that "[x] version can safely upgrade to [y] version" chart I skimmed hours ago... If the fans didn't kick in at 100% speed (and make a bunch of noise) during the boot process then I'd just work through the updates as the night goes on.