diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 * Github: [github.com/gnu4cn/ccna60d](https://github.com/gnu4cn/ccna60d)
 * Gitlab: [gitlab.com/unisko/ccna60d](https://gitlab.com/unisko/ccna60d/)
 * Gitbook：[ccna60d.xfoss.com](https://ccna60d.xfoss.com/)
-* PDF 版本：[ccna60d.pdf](https://github.com/gnu4cn/ccna60d/tree/9e798f46959af227e50de97213941157c220a70b/ccna60d.pdf)
+* PDF 版本：[ccna60d.pdf](https://github.com/gnu4cn/ccna60d/releases/download/v1.0.2/book.pdf)
 
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