A first computer includes a processor programmed to receive from a second computer a request to install a computer update. The request includes identification data. The first computer is further programmed to request, from a third computer, remote from the vehicle and from the second computer, a first authentication for the request to install the computer update. The request includes the identification data. The first computer receives the first authentication from the third computer. The first computer is further programmed to send, to a user device, an instruction to request from a user, a second authentication of the request to install the computer update. The first computer receives the second authentication from the user and installs the computer code.