Apple has released iOS 15.7.1 and iPadOS 15.7.1, operating system updates that are designed for older iPhones and iPads that can’t run iOS 16 and iPadOS 16.
According to Apple’s release notes, the updates include important security fixes and is recommended for all users. iOS 15.7.1 and iPadOS 15.7.1 can be downloaded on iPhones and iPads by going to Settings > General > Software Update.