Your iPhone might have updated itself recently without you even knowing it happened. This silent update is a new feature for critical security fixes, but you need to make sure your device is actually protected.
Your iPhone just got a critical security update, and you probably didn't even notice. Apple is now pushing 'Rapid Security Responses' that install in the background.
Unlike major iOS updates that require a restart and your explicit permission, these new rapid patches are designed to fix urgent vulnerabilities quickly and silently.