Update Your Mac Right Now to Avoid This Massive Security Bug Share Photo: Stephen Lam, Getty Images To sign up for our daily newsletter covering the latest news, features and reviews, head HERE. For a running feed of all our stories, follow us on Twitter HERE. Or you can bookmark the Gizmodo Australia homepage to visit whenever you need a news fix. If you haven’t already, you should update your Mac right now. A recently patched zero-day vulnerability in macOS operating systems has been allowing hackers to bypass much of Apple’s security protocols and deploy malware on an unknown amount of computers, new research shows.