The invention provides a method for updating a data carrier inserted in a telecommunication end device with regard to a data-carrier application executable in the data carrier, comprising the steps of: making updating data available to a security application installed in the data carrier; updating the data carrier according to the updating data, the updating of the data carrier comprising the steps of: transferring at least a part of the updating data from the security application to a programming interface installed in the telecommunication end device and adapted for communication between the telecommunication end device and the data carrier; onward transferring the transferred updating data from the programming interface to a data-carrier management of the data carrier installed in the data carrier; updating the data carrier according to the onward transferred updating data.