https://www.cnet.com/news/apple-just-turned-your-ancient-airport-express-router-into-an-airplay-2-wireless-speaker-dongle/

You've got to hand it to Apple. Even though the company hasn't updated its AirPort Express router since 2012, and even though it discontinued the entire AirPort line earlier this year, Apple isn't just letting its Wi-Fi router become a doorstop. Today, Apple imbued the AirPort with a brand-new power, one that could keep it in rotation for years to come.

As 9to5Mac and MacRumors report, a new firmware update adds AirPlay 2 to the venerable Wi-Fi router, effectively allowing you to add an additional wireless speaker capable of multiroom audio to your house, just by downloading the update and plugging a wired speaker into the AirPort Express's AUX jack, and then beaming sound from your Apple laptop, tablet or phone.