Apple has released iOS 11.2.2 and macOS High Sierra 10.13.2 with, among other things, security fixes for the recently reported Spectre vulnerability. iOS 11.2.2 can be downloaded for free on all eligible devices over-the-air in the Settings app. Go to Settings --> General --> Software Update. macOS High Sierra 10.13.2 is a free update for all customers who have a compatible machine. The update can be downloaded using the Mac App Store.