In addition to the release iOS 10.3.3 Apple has released three more software updates for Mac computers, models Apple Watch and Apple TV of the fourth generation: macOS Sierra 10.12.6, watchOS 3.2.3 and tvOS 10.2.2.
These are bug fixes to improve the performance and security of your devices, so don't expect major changes or new features. Support document Apple lists the security patches for macOS Sierra 10.12.6, watchOS 3.2.3, and tvOS 10.2.2.
You can update your Mac to macOS Sierra 10.12.6 by clicking on Updates on Mac App Store. The update will soon be available for download in Mac purchases App Store using this link.
To install tvOS 10.2.2, go to Settings → System → Software Update and select “check for updates”.
If an update is available, a message will appear, select Download and install, and follow the instructions.
To enable automatic check for updates, activate the Automatic update option in Settings → System → Software update.
watchOS 3.2.3 should be installed through the Watch app on your iPhone: Click on My Watch at the bottom of the app, then General → Software Update.
When an update is found, click Download and Install, enter the password for iPhone if required, and then accept the terms and conditions. The update will download to your Apple Watch.
Your Apple Watch should be at least 50 percent charged, connected to the charger, and near your phone until installation is complete. It usually takes a long time to update, so you can have your coffee in time.
Before updating your watch to watchOS 3.2.3, it is recommended that you update iPhone to iOS 10.3.3.