diff --git a/drf_writable_nested/mixins.py b/drf_writable_nested/mixins.py
index 134ae7e..34d26f3 100644
--- a/drf_writable_nested/mixins.py
+++ b/drf_writable_nested/mixins.py
@@ -400,10 +400,13 @@ def get_fields(self):
     def _validate_unique_fields(self, validated_data):
         for field_name in self._unique_fields:
             unique_validator = UniqueValidator(self.Meta.model.objects.all())
-            unique_validator.set_context(self.fields[field_name])
-
             try:
-                unique_validator(validated_data[field_name])
+                # `set_context` removed on DRF >= 3.11, pass in via __call__ instead
+                if hasattr(unique_validator, 'set_context'):
+                    unique_validator.set_context(self.fields[field_name])
+                    unique_validator(validated_data[field_name])
+                else:
+                    unique_validator(validated_data[field_name], self.fields[field_name])
             except ValidationError as exc:
                 raise ValidationError({field_name: exc.detail})