They can deliver improvements to individual apps like Safari and can be used to quickly patch vulnerabilities that pose a threat to users.
The company says that they will only be delivered to devices running the latest version of iOS, iPadOS, and macOS. That means your iPhone should be running iOS 16.4.1, iPads should be on iPadOS 16.4.1, and Macs should have macOS 13.3.1.
The update is 85MB in size and should only take some minutes to download. The rollout is staggered, per Twitter user Aaron @aaronp613. So if you still haven’t received it or are still having trouble installing it, the issue will likely be resolved in the next 48 hours.
The Rapid Security Responses are installed automatically by default, but can be disabled. Some of these updates won’t even need you to restart your device.