diff --git a/virl2_client/models/groups.py b/virl2_client/models/groups.py
index 18addbc..2ebf51c 100644
--- a/virl2_client/models/groups.py
+++ b/virl2_client/models/groups.py
@@ -86,7 +86,7 @@ def create_group(
         description: str = "",
         members: list[str] | None = None,
         labs: list[dict[str, str]] | None = None,
-        permissions: str = "",
+        permissions: str | None = None,
     ) -> dict:
         """
         Create a group.