These updates are available for macOS High Sierra 10.13.2, macOS Sierra 10.12.6, and OS X El Capitan 10.11.6. macOS High Sierra 10.13.3, Security Update 2018-001 Sierra, Security Update 2018-001 El Capitan These updates fix a vast array of security bugs, most prominently for macOS Sierra and OS X El Capitan as the updates patch the Meltdown flaw.Įnsuring your software is always up-to-date is one of the best ways to maintain your Apple product’s security, so without further ado, following is a list of key details in each update as well as where you can obtain them for your Apple device. Security News macOS Sierra, OS X El Capitan Updates Patch Meltdown FlawĪpple has just released macOS High Sierra 10.13.3, Security Update 2018-001 Sierra and Security Update 2018-001 El Capitan, Safari 11.0.3, iOS 11.2.5, watchOS 4.2.2 and tvOS 11.2.5.