diff --git a/AimeNet/AppJsonSerializerContext.cs b/AimeNet/SerializerContext.cs
similarity index 78%
rename from AimeNet/AppJsonSerializerContext.cs
rename to AimeNet/SerializerContext.cs
index 41fc560..a4b817f 100644
--- a/AimeNet/AppJsonSerializerContext.cs
+++ b/AimeNet/SerializerContext.cs
@@ -4,6 +4,7 @@ namespace AimeNet;
 
 public record SystemState(
     [property: JsonPropertyName("apiVersion")] int ApiVersion,
+    [property: JsonPropertyName("gameId")] string GameId,
     [property: JsonPropertyName("serverName")] string ServerName);
 
 public record CardReadRequest(
@@ -12,4 +13,4 @@ public record CardReadRequest(
 [JsonSerializable(typeof(SystemState))]
 [JsonSerializable(typeof(CardReadRequest))]
 [JsonSourceGenerationOptions(WriteIndented = true)]
-public partial class AppJsonSerializerContext : JsonSerializerContext;
\ No newline at end of file
+public partial class SerializerContext : JsonSerializerContext;
\ No newline at end of file