Apple today released updates to iOS 12.5.7, macOS 11.7.3 and more, allowing older devices like the iPhone 5s to get upgrades as well.

The updates for older devices cover bug fixes and security patches in iOS 16.3 and macOS Ventura. Apple officially lists at least 14 security issues in the security patch notes, and Apple is using the update to fix security vulnerabilities in these older devices.
The version updates that Apple is rolling out for older devices.
- iOS 12.5.7
- iOS 15.7.3
- iPadOS 15.7.3
- macOS Big Sur 11.7.3
- macOS Monterey 12.6.3
Careful users may notice that iOS 12 jumps directly to iOS 15, as all devices eligible for the iOS 13 upgrade can be upgraded to iOS 15.
The oldest device supported by iOS 12.5.7 is the iPhone 5s, released in September 2013. macOS Big Sur supports the oldest Macs, the 2013 MacBook Air, Mac Pro and MacBook Pro.
Apple officially says that this update fixes problems with AppleMobileFileIntegrity, curl, dcerpc, DiskArbitration, DriverKit, Intel Graphics Driver, PackageKit, Kernel, Mail Exchange, Maps, Screen Time, Weather, WebKit, and Windows Installer.