Apple has released iOS 12.4.6 for older model iPhone and iPad devices that are not able to run iOS 13.4 and iPadOS 13.4.
The iOS 12.4.6 is said to include important security updates and thus is recommended for eligible users to download and install onto their devices. No new features are expected to be included with iOS 12.4.6.
Devices eligible for the iOS 12.4.6 update include iPhone 6 Plus, iPhone 6, iPhone 5s, iPod touch 6th generation, iPad Air 1, iPad Mini 2, and iPad Mini 3. Newer iPhone and iPad models are able to download iOS 13.4 and iPadOS 13.4 instead.
Release notes accompanying the iOS 12.4.6 update download are very brief stating that it “provides important security updates” and is therefore recommended for all users who are eligible for the update.