A method for joining at least two workpieces using a punch rivet arrangement comprising a rivet and a collar. The method includes placing the rivet on a first side of the workpieces which form a stacked workpiece arrangement, placing the collar on a die arranged on a second side of the workpiece arrangement, and punching the rivet with a punch force through the workpiece arrangement. The workpiece arrangement is supported by a support surface of the collar, and the collar is supported by a first engagement surface of the die. The method includes modifying the collar by applying a modification force to the collar, wherein the modification force is higher than the punch force, and wherein the modification of the collar allows a second engagement surface of the die to apply a swaging force onto the collar so that material flows into at least one radial recess of the rivet.