How can I update random value of radius after every cycle?

Here is my following code:

 public void start(Stage primaryStage) throws Exception {
        Pane root = new Pane();
        Scene scene = new Scene(root, 500, 600);
        Random rand = new Random();

       int random = rand.nextInt(100-5)+5;
       Circle circle = new Circle(0, 10, random);
       circle.setFill(Color.RED);
        root.getChildren().add(circle);

       Timeline timeline = new Timeline(new KeyFrame(
              Duration.seconds(2),
        new KeyValue(circle.translateXProperty(), 600)
      ));
        timeline.setCycleCount(Animation.INDEFINITE);
        timeline.setAutoReverse(false);

         timeline.play();

        primaryStage.setScene(scene);
        primaryStage.show();

    }

In this code it only update the random value once, but I want it to update random value after each cycle. Is there any way I can update my random value after each cycle? Any help is appreciated!