Apple has released incremental updates to a slew of Apple products, including watchOS, macOS, iPadOS, iOS, and the HomePod.
Update 15.4.1 for iOS was introduced along with watchOS 8.5.1, macOS 12.3.1, and HomePod 15.4.1 to address ongoing operating system issues. The software quickly solved battery drain on iPads and iPhones in standby mode, as well as security fixes. watchOS brought security and bug patches, while the HomePod update specifically fixes Siri non-response in HomeKit-compatible accessories.
As for macOS, 12.3.1 resolves a conflict in USB-C and Thunderbolt monitors when connected to a 2018 Mac mini, and an issue where Bluetooth disconnects when playing audio through Beats headphones.
All the aforementioned updates are now available for download on the respective devices. It is recommended that the device has more than 50% charge, with the Apple Watch connected to an iPhone for it to work.