diff --git a/tests/tricky_cases/test_falsy_instances.py b/tests/tricky_cases/test_falsy_instances.py
index 5d98e55..c0f453c 100644
--- a/tests/tricky_cases/test_falsy_instances.py
+++ b/tests/tricky_cases/test_falsy_instances.py
@@ -20,7 +20,7 @@ async def create_async_resource() -> typing.AsyncIterator[dict[str, typing.Any]]
 
 
 class TrickyDIContainer(BaseContainer):
-    singleton = providers.Singleton(list)
+    singleton = providers.Singleton(list[object])
     sync_resource = providers.Resource(create_sync_resource)
     async_resource = providers.Resource(create_async_resource)
 
diff --git a/that_depends/providers/factories.py b/that_depends/providers/factories.py
index a4370c4..a3a1094 100644
--- a/that_depends/providers/factories.py
+++ b/that_depends/providers/factories.py
@@ -10,7 +10,7 @@
 class Factory(AbstractFactory[T_co]):
     __slots__ = "_factory", "_args", "_kwargs", "_override"
 
-    def __init__(self, factory: type[T_co] | typing.Callable[P, T_co], *args: P.args, **kwargs: P.kwargs) -> None:
+    def __init__(self, factory: typing.Callable[P, T_co], *args: P.args, **kwargs: P.kwargs) -> None:
         super().__init__()
         self._factory: typing.Final = factory
         self._args: typing.Final = args
diff --git a/that_depends/providers/singleton.py b/that_depends/providers/singleton.py
index d1d2a34..3b62895 100644
--- a/that_depends/providers/singleton.py
+++ b/that_depends/providers/singleton.py
@@ -11,7 +11,7 @@
 class Singleton(AbstractProvider[T_co]):
     __slots__ = "_factory", "_args", "_kwargs", "_override", "_instance", "_resolving_lock"
 
-    def __init__(self, factory: type[T_co] | typing.Callable[P, T_co], *args: P.args, **kwargs: P.kwargs) -> None:
+    def __init__(self, factory: typing.Callable[P, T_co], *args: P.args, **kwargs: P.kwargs) -> None:
         super().__init__()
         self._factory: typing.Final = factory
         self._args: typing.Final = args