diff --git a/Src/Notion.Client/NotionAPIErrorCode.cs b/Src/Notion.Client/NotionAPIErrorCode.cs
index 97984f98..2ca2573f 100644
--- a/Src/Notion.Client/NotionAPIErrorCode.cs
+++ b/Src/Notion.Client/NotionAPIErrorCode.cs
@@ -42,6 +42,9 @@ public enum NotionAPIErrorCode
         [EnumMember(Value = "internal_server_error")]
         InternalServerError,
 
+        [EnumMember(Value = "bad_gateway")]
+        BadGateway,
+
         [EnumMember(Value = "service_unavailable")]
         ServiceUnavailable,