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Late Wednesday night, Apple released a small “quick security update” to iOS 16.2 beta released Tuesday, — but what exactly this entails is not known.
Not much is known about the updates yet, which appear to be some kind of critical security fix. The update is very small, weighing less than 100 MB.
There are some specific details. It can be removed by the user. Also, it doesn't appear in new downloads of iOS 16.2 beta 3, which became available on Tuesday afternoon.
This is clearly the first notable rollout of a new feature that separates urgent security updates from major iOS updates.
The latest batch of operating systems, including iPadOS 16 and macOS Ventura, have a new feature called Security Quick Response. This new feature separates security patches from software updates, so the OS will protect users faster than waiting for an item or sub-item to be released.
In iOS 16, this setting is under Settings > General > Software update > Automatic updates. The switch titled “Install security responses and system files” says that fixes for security errors and system files will be installed automatically.
The toggle is in the same location under System Preferences in macOS Ventura as it is in iPadOS because Apple redesigned the old System Preferences app to look like iOS Settings.