Remember when Apple promised security updates to those who wanted to stick on iOS 14 rather than upgrade to iOS 15? Here's that promise on Apple's support page: If you're using iOS or iPadOS 14.5 or ...
Apple is encouraging people who are still running iOS 14 to update to iOS 15, a reversal of an earlier policy that saw the company allowing iOS 14 users to choose not to install the iOS 15 update.