Hot on the heels of iOS 10 and watchOS 3, Apple on Tuesday released tvOS 10. The software update is available free and compatible with all fourth-gen Apple TVs—the latest generation of Apple's popular set-top box.
tvOS 10 should install automatically on your Apple TV, but depending on your settings you may have to push it manually. You can do this by navigating to System > Software Updates > Update Software on your device.