diff --git a/Class/SecureJsonService.cs b/Class/SecureJsonService.cs
index 5c92a91..b166314 100644
--- a/Class/SecureJsonService.cs
+++ b/Class/SecureJsonService.cs
@@ -60,7 +60,7 @@ namespace SunlightAggregationTerminal.Class
 
                 // 4. JSON 反序列化
                 string jsonString = Encoding.UTF8.GetString(jsonBytes);
-                T result = JsonSerializer.Deserialize<T>(jsonString);
+                T result = JsonSerializer.Deserialize<T>(jsonString)!;
 
                 return result;
             }