diff --git a/fastapi_users/authentication/authenticator.py b/fastapi_users/authentication/authenticator.py
index 6117765f..897228a2 100644
--- a/fastapi_users/authentication/authenticator.py
+++ b/fastapi_users/authentication/authenticator.py
@@ -31,7 +31,9 @@ class DuplicateBackendNamesError(Exception):
     pass
 
 
-EnabledBackendsDependency = DependencyCallable[Sequence[AuthenticationBackend[models.UP, models.ID]]]
+EnabledBackendsDependency = DependencyCallable[
+    Sequence[AuthenticationBackend[models.UP, models.ID]]
+]
 
 
 class Authenticator(Generic[models.UP, models.ID]):
@@ -62,7 +64,9 @@ class Authenticator(Generic[models.UP, models.ID]):
         active: bool = False,
         verified: bool = False,
         superuser: bool = False,
-        get_enabled_backends: Optional[EnabledBackendsDependency[models.UP, models.ID]] = None,
+        get_enabled_backends: Optional[
+            EnabledBackendsDependency[models.UP, models.ID]
+        ] = None,
     ):
         """
         Return a dependency callable to retrieve currently authenticated user and token.
@@ -106,7 +110,9 @@ class Authenticator(Generic[models.UP, models.ID]):
         active: bool = False,
         verified: bool = False,
         superuser: bool = False,
-        get_enabled_backends: Optional[EnabledBackendsDependency[models.UP, models.ID]] = None,
+        get_enabled_backends: Optional[
+            EnabledBackendsDependency[models.UP, models.ID]
+        ] = None,
     ):
         """
         Return a dependency callable to retrieve currently authenticated user.
@@ -157,8 +163,8 @@ class Authenticator(Generic[models.UP, models.ID]):
     ) -> Tuple[Optional[models.UP], Optional[str]]:
         user: Optional[models.UP] = None
         token: Optional[str] = None
-        enabled_backends: Sequence[AuthenticationBackend[models.UP, models.ID]] = kwargs.get(
-            "enabled_backends", self.backends
+        enabled_backends: Sequence[AuthenticationBackend[models.UP, models.ID]] = (
+            kwargs.get("enabled_backends", self.backends)
         )
         for backend in self.backends:
             if backend in enabled_backends:
diff --git a/fastapi_users/fastapi_users.py b/fastapi_users/fastapi_users.py
index 85edb1bd..980b674c 100644
--- a/fastapi_users/fastapi_users.py
+++ b/fastapi_users/fastapi_users.py
@@ -72,7 +72,9 @@ class FastAPIUsers(Generic[models.UP, models.ID]):
         return get_reset_password_router(self.get_user_manager)
 
     def get_auth_router(
-        self, backend: AuthenticationBackend[models.UP, models.ID], requires_verification: bool = False
+        self,
+        backend: AuthenticationBackend[models.UP, models.ID],
+        requires_verification: bool = False,
     ) -> APIRouter:
         """
         Return an auth router for a given authentication backend.
diff --git a/tests/test_manager.py b/tests/test_manager.py
index 30fa5a5e..2eab6c96 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -139,7 +139,7 @@ class TestCreateUser:
     ):
         user = UserCreate(email=email, password="guinevere")
         created_user = await user_manager.create(user)
-        assert type(created_user) == UserModel
+        assert isinstance(created_user, UserModel)
 
         assert user_manager.on_after_register.called is True
 
@@ -151,7 +151,7 @@ class TestCreateUser:
             email="lancelot@camelot.b", password="guinevere", is_superuser=True
         )
         created_user = await user_manager.create(user, safe)
-        assert type(created_user) == UserModel
+        assert isinstance(created_user, UserModel)
         assert created_user.is_superuser is result
 
         assert user_manager.on_after_register.called is True
@@ -164,7 +164,7 @@ class TestCreateUser:
             email="lancelot@camelot.b", password="guinevere", is_active=False
         )
         created_user = await user_manager.create(user, safe)
-        assert type(created_user) == UserModel
+        assert isinstance(created_user, UserModel)
         assert created_user.is_active is result
 
         assert user_manager.on_after_register.called is True