I know that some of you like your legacy OS's but Apple has released three updates: iOS 15.6.1, iPadOS 15.6.1, and macOS 12.5.1 Monterey that we consider essential upgrades since Apple has uncovered a couple of serious security flaws that need to be patched. These holes allow hackers to take control of your devices and allow arbitrary code execution. These exploits are "in the wild" so it is a serious issue. Don't delay upgrade! You can install iOS and iPadOS updates by going to Settings > General Software Update; install macOS updates from System Preferences > Software Update.