diff -Naur marshmallow-3.21.0.orig/src/marshmallow/schema.py marshmallow-3.21.0/src/marshmallow/schema.py
--- marshmallow-3.21.0.orig/src/marshmallow/schema.py	2024-02-26 20:43:44.000000000 +0100
+++ marshmallow-3.21.0/src/marshmallow/schema.py	2024-02-27 21:54:51.917914969 +0100
@@ -26,7 +26,7 @@
 )
 from marshmallow.error_store import ErrorStore
 from marshmallow.exceptions import StringNotCollectionError, ValidationError
-from marshmallow.orderedset import OrderedSet
+from ordered_set import OrderedSet
 from marshmallow.utils import (
     EXCLUDE,
     INCLUDE,