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About Rapid Security Responses for iOS, iPadOS, and macOS
Rapid Security Responses deliver important security improvements between software updates.

Rapid Security Responses are a new type of software release for iPhone, iPad, and Mac. They deliver important security improvements between software updates — for example, improvements to the Safari web browser, the WebKit framework stack, or other critical system libraries. They may also be used to mitigate some security issues more quickly, such as issues that might have been exploited or reported to exist "in the wild."
New Rapid Security Responses are delivered only for the latest version of iOS, iPadOS and macOS — beginning with iOS 16.4.1, iPadOS 16.4.1, and macOS 13.3.1.
By default, your device allows Rapid Security Responses to be applied automatically and, if necessary, will prompt you to restart your device. To check your device settings:
iPhone or iPad: Go to Settings General Software Update Automatic Updates, then make sure that "Security Responses & System Files" is turned on.
Mac: Choose Apple menu  System Settings. Click General in the sidebar, then click Software Update on the right. Click the Show Details button next to Automatic Updates, then make sure that "Install Security Responses and system files" is turned on.
When a Rapid Security Response has been applied, a letter appears after the software version number, as in this example: macOS 13.3.1 (a).About Rapid Security Responses for iOS, iPadOS, and macOS
Rapid Security Responses deliver important security improvements between software updates.

Rapid Security Responses are a new type of software release for iPhone, iPad, and Mac. They deliver important security improvements between software updates — for example, improvements to the Safari web browser, the WebKit framework stack, or other critical system libraries. They may also be used to mitigate some security issues more quickly, such as issues that might have been exploited or reported to exist "in the wild."
New Rapid Security Responses are delivered only for the latest version of iOS, iPadOS and macOS — beginning with iOS 16.4.1, iPadOS 16.4.1, and macOS 13.3.1.
By default, your device allows Rapid Security Responses to be applied automatically and, if necessary, will prompt you to restart your device. To check your device settings:
iPhone or iPad: Go to Settings General Software Update Automatic Updates, then make sure that "Security Responses & System Files" is turned on.
Mac: Choose Apple menu  System Settings. Click General in the sidebar, then click Software Update on the right. Click the Show Details button next to Automatic Updates, then make sure that "Install Security Responses and system files" is turned on.
When a Rapid Security Response has been applied, a letter appears after the software version number, as in this example: macOS 13.3.1 (a).