diff --git a/AscNet.GameServer/Session.cs b/AscNet.GameServer/Session.cs
index 7609073b..f0c1a69c 100644
--- a/AscNet.GameServer/Session.cs
+++ b/AscNet.GameServer/Session.cs
@@ -1,6 +1,7 @@
 using System.Buffers.Binary;
 using System.Net.Mail;
 using System.Net.Sockets;
+using System.Text.Json;
 using AscNet.Common.Util;
 using MessagePack;