diff --git a/tests/test_tutor.py b/tests/test_tutor.py
index dae71a9..5ab0844 100644
--- a/tests/test_tutor.py
+++ b/tests/test_tutor.py
@@ -2,4 +2,4 @@ from tutor import __version__
 
 
 def test_version():
-    assert __version__ == '0.1.0'
+    assert __version__ == "0.1.0"
diff --git a/tutor/__init__.py b/tutor/__init__.py
index b794fd4..3dc1f76 100644
--- a/tutor/__init__.py
+++ b/tutor/__init__.py
@@ -1 +1 @@
-__version__ = '0.1.0'
+__version__ = "0.1.0"
diff --git a/tutor/models.py b/tutor/models.py
index 8a63d00..e4b40e2 100644
--- a/tutor/models.py
+++ b/tutor/models.py
@@ -109,7 +109,9 @@ class CardCopy:
     language: str = "English"
     collection: str = "Default"
     condition: typing.Optional[str] = None
-    created_date: datetime.datetime = dataclasses.field(default_factory=datetime.datetime.now)
+    created_date: datetime.datetime = dataclasses.field(
+        default_factory=datetime.datetime.now
+    )
 
 
 @dataclasses.dataclass