Apple has finally released iOS 16.4, and the update brings practical improvements, tons of new emoji, and fixes for more than 30 security issues. The last major update, 16.3, was released to the public in late January 2023, adding support for Apple’s newest HomePod and FIDO-certified Security Keys to protect Apple ID accounts, among other things. This was followed in mid-February by iOS 16.3.1, which introduced some critical security updates for iPhone and iPad.
https://screenrant.com/ios-164-iphone-update-new-features-security-fixes-emoji/