diff --git a/backend/sophon/core/models.py b/backend/sophon/core/models.py
index 422618c..db9e108 100644
--- a/backend/sophon/core/models.py
+++ b/backend/sophon/core/models.py
@@ -375,7 +375,7 @@ class ResearchGroup(SophonGroupModel):
 
     @classmethod
     def get_editable_fields(cls) -> set[str]:
-        return {}
+        return set()
 
     @classmethod
     def get_administrable_fields(cls) -> set[str]: