After the release of iOS 15.4 a few weeks ago, and without notice, Apple just released iOS 15.4.1 and iPadOS 15.4.1 to fix some issues like increased battery consumption which some users have complained about.
After two weeks with iOS 15.4, many users complained about increased battery consumption after the recent update. It wasn’t a widespread problem but it was quite common to think of a bug that Apple should fix, and the fix came today by surprise. Without previous Betas, without any type of notice
In addition to the versions for iPhone and iPad, Apple has also released corresponding versions for other devices. Thus, we already have watchOS 8.5.1, macOS 12.3.1 and tvOS 15.4.1 available, which also do not include any interesting news, only a long list of bug fixes. The HomePod also received its corresponding update to HomePod 15.4.1 Fixed issues with Siri that caused some devices to become unresponsive when trying to control using voice and HomePod.
Updates are already showing in the device settings. Remember that you can update manually by accessing these settings at any time, always with enough battery and with a WiFi network connected. Or you can enable automatic updates, although this means that the update will not be installed on your device until two or three weeks after its release. This odd behavior was recently confirmed by Federighi to be normal, and not a bug in the iOS auto-update system.