According to Apple’s release notes, iPadOS 16.3.1 provides important bug fixes and security updates. It can be downloaded on eligible iPhones and iPads over-the-air by going to Settings > General > Software Update.
tvOS 16.3.1 fixes a glitch with HomeKit compatibility. It can be downloaded by going to the Settings app on your Apple TV set-top box. Then go to System > Software Update.
watchOS 9.3.1offers bug fixes and performance improvements. Apple Watch owners can download the update by opening up the Apple Watch app on their iPhone and going to General > Software Update. To install the new software, the Apple Watch needs to have at least 50% battery, it needs to be placed on a charger, and it needs to be in range of the iPhone.
Article provided with permission from AppleWorld.Today