diff --git a/README.md b/README.md
index 7f9cd28..edba7bb 100644
--- a/README.md
+++ b/README.md
@@ -22,13 +22,13 @@
 > - [Windows_kernel_exploits](https://github.com/SecWiki/windows-kernel-exploits)
 > - [exploitdb](https://github.com/offensive-security/exploitdb/tree/master/exploits)
 
-[PDF版本](https://github.com/ycdxsb/WindowsPrivilegeEscalation/releases/download/20210429/README.pdf)
-
+[PDF版本](https://github.com/ycdxsb/WindowsPrivilegeEscalation/releases/download/20210514/README.pdf)
 
 
 - [2021](#2021)
   - [CVE-2021-28310](#cve-2021-28310)
   - [CVE-2021-24096](#cve-2021-24096)
+  - [CVE-2021-21551](#cve-2021-21551)
   - [CVE-2021-1732](#cve-2021-1732)
 - [2020](#2020)
   - [CVE-2020-17087](#cve-2020-17087)