diff --git a/django-stubs/contrib/auth/mixins.pyi b/django-stubs/contrib/auth/mixins.pyi
index e75f62f..50b7263 100644
--- a/django-stubs/contrib/auth/mixins.pyi
+++ b/django-stubs/contrib/auth/mixins.pyi
@@ -1,4 +1,4 @@
-from typing import Any, Callable, List
+from typing import Any, Callable, List, Optional
 
 from django import http
 from django.http.response import HttpResponse, HttpResponseRedirect
@@ -23,6 +23,6 @@ class PermissionRequiredMixin(AccessMixin):
     def dispatch(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse: ...
 
 class UserPassesTestMixin(AccessMixin):
-    def test_func(self) -> None: ...
+    def test_func(self) -> Optional[bool]: ...
     def get_test_func(self) -> Callable: ...
     def dispatch(self, request: http.HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse: ...