OverDrive has begun phasing the old OverDrive app out. If you already use the Libby app, you don’t need to do anything , but OverDrive would like to get people using the old app to switch over to Libby by the end of 2022.
Alternatively, you will continue be able to borrow and read items using a generic web browser (for instance, Chrome, Edge, Firefox, Opera, and so on).