A method for testing an updated version of an application for vehicles. In the method, input data for the application, which are used for a present version of the application on at least one vehicle, and output data of the present version of the application are received by a vehicle-external computing system, from the at least one vehicle via a wireless data link. The updated version of the application is executed on the vehicle-external computing system using the received input data. Output data of the updated version of the application are compared with the received output data of the present version of the application. An evaluation of the updated version of the application being carried out, based on the comparison.