diff --git a/injection/core/module.py b/injection/core/module.py
index fbc3308..5f78485 100644
--- a/injection/core/module.py
+++ b/injection/core/module.py
@@ -135,13 +135,15 @@ def __str__(self) -> str:
 class Injectable(Protocol[_T]):
     __slots__ = ()
 
-    def __init__(self, __factory: Callable[[], _T] = ..., /): ...
+    def __init__(self, __factory: Callable[[], _T] = None, /):
+        pass
 
     @property
     def is_locked(self) -> bool:
         return False
 
-    def unlock(self): ...
+    def unlock(self):
+        pass
 
     @abstractmethod
     def get_instance(self) -> _T:
@@ -626,7 +628,8 @@ def update(self, module: Module):
         return self
 
     @singledispatchmethod
-    def on_event(self, event: Event, /): ...
+    def on_event(self, event: Event, /):
+        pass
 
     @on_event.register
     @contextmanager
diff --git a/injection/exceptions.py b/injection/exceptions.py
index 9a4646c..c9b98a4 100644
--- a/injection/exceptions.py
+++ b/injection/exceptions.py
@@ -10,7 +10,7 @@
 
 
 class InjectionError(Exception):
-    __slots__ = ()
+    pass
 
 
 class NoInjectable(KeyError, InjectionError):
@@ -26,12 +26,12 @@ def cls(self) -> type:
 
 
 class ModuleError(InjectionError):
-    __slots__ = ()
+    pass
 
 
 class ModuleLockError(ModuleError):
-    __slots__ = ()
+    pass
 
 
 class ModuleNotUsedError(KeyError, ModuleError):
-    __slots__ = ()
+    pass