Along with the release of iOS 10.2 final , Apple has released an update of iTunes Version 12.5.5 that supports for iOS 10.2.1, tvOS 10.1.1, watchOS 3.1.3, and macOS
Sierra 10.12.3.

This update adds some minor app and performance improvements.
You can download the iTunes update Version 12.5.5 from the Updates tab on the Mac App Store.You can also download iTunes 12.5.5 for Windows from this link

You can download the iTunes update Version 12.5.5 from the Updates tab on the Mac App Store.