diff --git a/README.md b/README.md
index 9f8bcc6..891a9a7 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,7 @@
 
 - ### [在线阅读地址](https://guoshuyu.cn/home/wx/)
 
-- ### [PDF 下载地址](https://www.alipan.com/s/Ljz6YNE4jEr)
+- ### [PDF 下载地址](https://www.alipan.com/s/pWygf7REfvP)
 
 - ### [Github 地址 CarGuo](https://github.com/CarGuo)