diff --git a/example/config-app/config/redis.py b/example/config-app/config/redis.py
index ab1aa532..1f39b8b4 100644
--- a/example/config-app/config/redis.py
+++ b/example/config-app/config/redis.py
@@ -5,10 +5,8 @@
 
 @dataclass
 class RedisConfig:
-    host: str = field(default_factory=lambda: env('REDIS_HOST'))
-    port: int = field(default_factory=lambda: env('REDIS_PORT'))
-    db: int = field(default_factory=lambda: env('REDIS_DB'))
+    host: str = field(default_factory=lambda: env("REDIS_HOST"))
+    port: int = field(default_factory=lambda: env("REDIS_PORT"))
+    db: int = field(default_factory=lambda: env("REDIS_DB"))
 
-    options: dict = field(default_factory=lambda: {
-        'decode_responses': True
-    })
+    options: dict = field(default_factory=lambda: {"decode_responses": True})
diff --git a/example/config-app/tests/test_config_app.py b/example/config-app/tests/test_config_app.py
index ed2d8bee..cff20464 100644
--- a/example/config-app/tests/test_config_app.py
+++ b/example/config-app/tests/test_config_app.py
@@ -9,7 +9,7 @@
 
 class ConfigTest(unittest.TestCase):
     def test_it_loads_env_from_arguments(self):
-        os.environ.pop('PYTEST_CURRENT_TEST', None)
+        os.environ.pop("PYTEST_CURRENT_TEST", None)
         from fastapi_startkit import Application
 
         # We initialize the application with no env, so it should load the default env
@@ -39,20 +39,20 @@ def test_it_loads_env_from_arguments(self):
         self.assertEqual(RedisConfig().db, 0)
 
     def test_app_loads_env_data(self):
-        os.environ.pop('PYTEST_CURRENT_TEST', None)
+        os.environ.pop("PYTEST_CURRENT_TEST", None)
         from bootstrap.application import app
 
         self.assertEqual(RedisConfig().host, "host.default")
         self.assertEqual(RedisConfig().port, 0000)
         self.assertEqual(RedisConfig().db, 0)
 
-        app.set_environment('testing')
+        app.set_environment("testing")
         app.load_environment()
         self.assertEqual(RedisConfig().host, "host.testing")
         self.assertEqual(RedisConfig().port, 2222)
         self.assertEqual(RedisConfig().db, 2)
 
-        app.set_environment('production')
+        app.set_environment("production")
         app.load_environment()
 
         self.assertEqual(RedisConfig().host, "host.production")
@@ -62,36 +62,37 @@ def test_app_loads_env_data(self):
 
 class ConfigFacadeTest(unittest.TestCase):
     def setUp(self):
-        os.environ.pop('PYTEST_CURRENT_TEST', None)
+        os.environ.pop("PYTEST_CURRENT_TEST", None)
         from fastapi_startkit import Application
+
         self.app = Application(base_path=Path(__file__).resolve().parent.parent)
-        Config.set('redis', RedisConfig())
+        Config.set("redis", RedisConfig())
 
     def test_get_string_field(self):
-        self.assertEqual(Config.get('redis.host'), 'host.default')
+        self.assertEqual(Config.get("redis.host"), "host.default")
 
     def test_get_int_field(self):
-        self.assertEqual(Config.get('redis.port'), 0)
-        self.assertIsInstance(Config.get('redis.port'), int)
+        self.assertEqual(Config.get("redis.port"), 0)
+        self.assertIsInstance(Config.get("redis.port"), int)
 
     def test_get_dict_field(self):
-        self.assertEqual(Config.get('redis.options'), {'decode_responses': True})
+        self.assertEqual(Config.get("redis.options"), {"decode_responses": True})
 
     def test_get_nested_dotted_key(self):
-        self.assertIs(Config.get('redis.options.decode_responses'), True)
+        self.assertIs(Config.get("redis.options.decode_responses"), True)
 
     def test_has_existing_key(self):
-        self.assertTrue(Config.has('redis'))
+        self.assertTrue(Config.has("redis"))
 
     def test_has_missing_key(self):
-        self.assertFalse(Config.has('redis.nonexistent'))
+        self.assertFalse(Config.has("redis.nonexistent"))
 
     def test_get_missing_key_returns_none(self):
-        self.assertIsNone(Config.get('redis.nonexistent'))
+        self.assertIsNone(Config.get("redis.nonexistent"))
 
     def test_get_missing_key_returns_default(self):
-        self.assertEqual(Config.get('redis.nonexistent', 'fallback'), 'fallback')
+        self.assertEqual(Config.get("redis.nonexistent", "fallback"), "fallback")
 
     def test_set_overrides_value_at_runtime(self):
-        Config.set('redis.host', 'overridden-host')
-        self.assertEqual(Config.get('redis.host'), 'overridden-host')
+        Config.set("redis.host", "overridden-host")
+        self.assertEqual(Config.get("redis.host"), "overridden-host")