iOS 15.4 debuted March 14th just in time for the new iPhones. Features such as FaceID now working when you’re wearing a mask, and you’ll soon be able to store your Digital IDs such as driving licence. Tom’s Guide article “iOS 15.4 is out now …” is worth a read.
If you haven’t upgraded your iOS now is the time to do it. You’ll get some great new features and a security update in one hit.
You can read more from Apple about the security content of the update here.