iOS 12.5.5 Security Update Released for Older iPhone & iPad
Apple has released iOS 12.5.5 for users with older iPhone, iPad, and iPod touch devices that are incapable of running iOS 15 and iPadOS 15.
iOS 12.5.5 includes important security fixes and is therefore recommended to install for all devices that can get the update.
Separately, Mac users running macOS Catalina will find Security Update 2021-006 Catalina available for Macs that are not yet running Big Sur.