diff --git a/AKModel/tests/test_json_export.py b/AKModel/tests/test_json_export.py
index 80a08279cf8b70f115028b45f4c15747a41af419..5ec117497b2afd6bdb54cbc1507485303a2df451 100644
--- a/AKModel/tests/test_json_export.py
+++ b/AKModel/tests/test_json_export.py
@@ -37,7 +37,9 @@ class JSONExportTest(TestCase):
             is_active=True,
         )
 
-        cls.json_export_validator = construct_schema_validator("solver-input.schema.json")
+        cls.json_export_validator = construct_schema_validator(
+            "solver-input.schema.json"
+        )
 
     def setUp(self):
         self.client.force_login(self.admin_user)
@@ -120,7 +122,9 @@ class JSONExportTest(TestCase):
             with self.subTest(event=event):
                 self.set_up_event(event=event)
 
-                error = best_match(self.json_export_validator.iter_errors(self.export_dict))
+                error = best_match(
+                    self.json_export_validator.iter_errors(self.export_dict)
+                )
                 msg = "" if error is None else error.message
                 self.assertTrue(error is None, msg)
 
diff --git a/AKModel/utils.py b/AKModel/utils.py
index b53e6509a0a813b4430ca001c156520c6df5a86a..3a0b3f0d57cb646954cd34a9a76c5903ee74cc10 100644
--- a/AKModel/utils.py
+++ b/AKModel/utils.py
@@ -7,6 +7,7 @@ from referencing import Registry, Resource
 
 from AKPlanning import settings
 
+
 def construct_schema_validator(schema: str | dict) -> Validator:
     """Construct a validator for a JSON schema.
 
@@ -23,6 +24,4 @@ def construct_schema_validator(schema: str | dict) -> Validator:
     if isinstance(schema, str):
         with (schema_base_path / schema).open("r") as ff:
             schema = json.load(ff)
-    return Draft202012Validator(
-        schema=schema, registry=registry
-    )
+    return Draft202012Validator(schema=schema, registry=registry)