MacRumors published a story that Apple has released tvOS 13.3.1 for fourth and fifth-generation Apple TV.
Apple Releases tvOS 13.3.1 for Fourth and Fifth-Generation Apple TV
Apple today released tvOS 13.3.1, a minor update to the tvOS 13 operating system that runs on the fourth and fifth-generation Apple TV models.
Apple Releases tvOS 13.3.1 for Fourth and Fifth-Generation Apple TV