YouTube has announced that it will be closing down its custom apps on a number of aging devices this May. The move will affect the second-generation Apple TV and its predecessor, as well as iOS devices running iOS 6 and below.

"As we upgrade the YouTube Data API to bring more features, we'll begin shutting down the old version on April 20, 2015," Google explains in a post on its YouTube Help page. "This will result in the current YouTube app not working on certain device models from 2012 and older."

In addition to the devices mentioned above, the change will affect TVs and Blu-ray players manufactured by Sony and Panasonic, devices running Google TV versions 3 and 4, and game consoles that do not support Flash or HTML5.

Certain devices, such as Smart TVs that have Flash and/or HTML5, and older iOS devices, can access YouTube through their built-in browsers. Users can also update their Google TV to the latest software, and iOS devices that are supported by iOS 7 or iOS 8, to regain YouTube support.

But if you have an older Apple TV or Smart TV and you rely on the YouTube app, it would seem it might be time for an upgrade.