Apple has released iOS 9.3. The download is available in the usual way. From your iOS device, tap on Settings > General > Software Update. It is always a good idea to make a back up first.
The update weighs in at 1.5 GB. Plan on using a Wi-Fi connection and make sure your device is plugged in.
The update improves Notes, Health, Apple Music and a new feature called Night Shift that may help you sleep better by removing some of the bluer light from your display at night. There are additional improvements and bug fixes.