If you use a Mac or iOS device, hit that update button today! Seriously, stop hitting that "Remind me later" button. It was recently discovered that Mac and iOS systems are vulnerable to two flaws - Meltdown and Spectre. This is a large security risk but Apple said they have, "already released mitigations in iOS 11.2, macOS 10.13.2, and tvOS 11.2 to help defend against Meltdown. Apple Watch is not affected by Meltdown. In the coming days we plan to release mitigations in Safari to help defend against Spectre." We will keep you updated on this when we know more!