Apple previously supported old iPhone 5S and iPhone 6 models that couldn't upgrade to iOS 13, releasing security-only updates for iOS 12 semi-regularly for nearly three years after iOS 13 came out.

The security update was pushed to newer devices in iOS 16.1.2 on November 30 and iOS 15.7.2 on December 13. It’s not clear why Apple waited nearly eight weeks to deliver it to iOS 12 devices.