https://arstechnica.com/gadgets/2021/12/apples-ios-15-2-and-macos-12-1-updates-hit-supported-devices-today/

As has now become a custom, Apple has released new OS updates for virtually all of its devices in one giant volley today. The releases include iOS 15.2 and iPadOS 15.2, macOS Monterey 12.1, watchOS 8.3, and tvOS 15.2