diff --git a/main.py b/main.py
index 30da127..868e845 100644
--- a/main.py
+++ b/main.py
@@ -148,6 +148,7 @@ def update():
     # 上下墙壁反弹
     if ball.top <= 0 or ball.bottom >= HEIGHT:
         ball_speed_y *= -1
+        sounds.bump.set_volume(1.6)
         sounds.bump.play()
 
     # 左球拍碰撞加分