If you own a smart TV or an iOS device that's getting a bit long in the tooth, you may need to do some upgrading this week if you want to continue using the YouTube app. Due to certain changes in the app's API, it'll no longer work on a number of models released in 2012 or earlier, including second-generation Apple TVs, Panasonic TVs, Sony TVs and Blu-ray players, as well as devices running Google TV versions 1 or 2. You'll know you're affected if a video showing the notice above plays upon firing up the app, though most models released in 2013 or later are safe.