diff --git a/docs/WechatTenpayV3/Advanced_RequestSensitiveDataEncryption.md b/docs/WechatTenpayV3/Advanced_RequestSensitiveDataEncryption.md
index fa65f73a..b2967047 100644
--- a/docs/WechatTenpayV3/Advanced_RequestSensitiveDataEncryption.md
+++ b/docs/WechatTenpayV3/Advanced_RequestSensitiveDataEncryption.md
@@ -133,7 +133,6 @@ client.EncryptRequestSensitiveProperty(request);
 
 ```csharp
 using StackExchange.Redis;
-using Newtonsoft.Json;
 
 public class RedisCertificateManager : CertificateManager
 {