Apple Again Tests Background Security Updates in iOS 26.3 and macOS Tahoe 26.3
Apple is once again testing its new Background Security Improvement feature that first rolled out in iOS 26.1, iPadOS 26.1, and macOS Tahoe 26.1. Following a previous test earlier this week, developers and public beta testers who are running iOS 26.3, iPadOS 26.3, or macOS Tahoe 26.3 can now install a second Background Security Improvement update for testing purposes.
8 Jan 19:27 · MacRumors