public function update_status( $new_status ) {
		$old_status = $this->status;

		if ( $old_status !== $new_status ) {
			$this->status = $new_status;

			$this->save();

			/**
			 * Action hook to after update enrolment status
			 *
			 * @since DozentLMS v.1.0.0
			 *
			 * @param  int  $ID  enrolment ID
			 * @param  string  $old_status  Current status of this enrolment
			 * @param  string  $new_status  New Enrolment Status
			 * @param  object  $this  Current enrolment data as model object
			 */

			do_action( 'dozent_enrolment_status_updated', $this->ID, $old_status, $new_status, $this );
		}
	}