diff --git a/examples/miniapps/fastapi/giphynavigator/application.py b/examples/miniapps/fastapi/giphynavigator/application.py
index 8a8f8a52..28883eaa 100644
--- a/examples/miniapps/fastapi/giphynavigator/application.py
+++ b/examples/miniapps/fastapi/giphynavigator/application.py
@@ -8,8 +8,8 @@ from . import endpoints
 
 def create_app() -> FastAPI:
     container = Container()
-    container.config.from_yaml('config.yml')
-    container.config.giphy.api_key.from_env('GIPHY_API_KEY')
+    container.config.from_yaml("config.yml")
+    container.config.giphy.api_key.from_env("GIPHY_API_KEY")
     container.wire(modules=[endpoints])
 
     app = FastAPI()
diff --git a/examples/miniapps/fastapi/giphynavigator/endpoints.py b/examples/miniapps/fastapi/giphynavigator/endpoints.py
index ab4f1b88..2761f203 100644
--- a/examples/miniapps/fastapi/giphynavigator/endpoints.py
+++ b/examples/miniapps/fastapi/giphynavigator/endpoints.py
@@ -23,7 +23,7 @@ class Response(BaseModel):
 router = APIRouter()
 
 
-@router.get('/', response_model=Response)
+@router.get("/", response_model=Response)
 @inject
 async def index(
         query: Optional[str] = None,
@@ -38,7 +38,7 @@ async def index(
     gifs = await search_service.search(query, limit)
 
     return {
-        'query': query,
-        'limit': limit,
-        'gifs': gifs,
+        "query": query,
+        "limit": limit,
+        "gifs": gifs,
     }
diff --git a/examples/miniapps/fastapi/giphynavigator/giphy.py b/examples/miniapps/fastapi/giphynavigator/giphy.py
index 22a5f6a4..bab017c5 100644
--- a/examples/miniapps/fastapi/giphynavigator/giphy.py
+++ b/examples/miniapps/fastapi/giphynavigator/giphy.py
@@ -5,7 +5,7 @@ from aiohttp import ClientSession, ClientTimeout
 
 class GiphyClient:
 
-    API_URL = 'https://api.giphy.com/v1'
+    API_URL = "https://api.giphy.com/v1"
 
     def __init__(self, api_key, timeout):
         self._api_key = api_key
@@ -13,11 +13,11 @@ class GiphyClient:
 
     async def search(self, query, limit):
         """Make search API call and return result."""
-        url = f'{self.API_URL}/gifs/search'
+        url = f"{self.API_URL}/gifs/search"
         params = {
-            'q': query,
-            'api_key': self._api_key,
-            'limit': limit,
+            "q": query,
+            "api_key": self._api_key,
+            "limit": limit,
         }
         async with ClientSession(timeout=self._timeout) as session:
             async with session.get(url, params=params) as response:
diff --git a/examples/miniapps/fastapi/giphynavigator/services.py b/examples/miniapps/fastapi/giphynavigator/services.py
index 1c86e0d7..1ee6eb64 100644
--- a/examples/miniapps/fastapi/giphynavigator/services.py
+++ b/examples/miniapps/fastapi/giphynavigator/services.py
@@ -15,4 +15,4 @@ class SearchService:
 
         result = await self._giphy_client.search(query, limit)
 
-        return [{'url': gif['url']} for gif in result['data']]
+        return [{"url": gif["url"]} for gif in result["data"]]
diff --git a/examples/miniapps/fastapi/giphynavigator/tests.py b/examples/miniapps/fastapi/giphynavigator/tests.py
index 4ae91493..18116971 100644
--- a/examples/miniapps/fastapi/giphynavigator/tests.py
+++ b/examples/miniapps/fastapi/giphynavigator/tests.py
@@ -11,7 +11,7 @@ from giphynavigator.giphy import GiphyClient
 
 @pytest.fixture
 def client(event_loop):
-    client = AsyncClient(app=app, base_url='http://test')
+    client = AsyncClient(app=app, base_url="http://test")
     yield client
     event_loop.run_until_complete(client.aclose())
 
@@ -20,29 +20,29 @@ def client(event_loop):
 async def test_index(client):
     giphy_client_mock = mock.AsyncMock(spec=GiphyClient)
     giphy_client_mock.search.return_value = {
-        'data': [
-            {'url': 'https://giphy.com/gif1.gif'},
-            {'url': 'https://giphy.com/gif2.gif'},
+        "data": [
+            {"url": "https://giphy.com/gif1.gif"},
+            {"url": "https://giphy.com/gif2.gif"},
         ],
     }
 
     with app.container.giphy_client.override(giphy_client_mock):
         response = await client.get(
-            '/',
+            "/",
             params={
-                'query': 'test',
-                'limit': 10,
+                "query": "test",
+                "limit": 10,
             },
         )
 
     assert response.status_code == 200
     data = response.json()
     assert data == {
-        'query': 'test',
-        'limit': 10,
-        'gifs': [
-            {'url': 'https://giphy.com/gif1.gif'},
-            {'url': 'https://giphy.com/gif2.gif'},
+        "query": "test",
+        "limit": 10,
+        "gifs": [
+            {"url": "https://giphy.com/gif1.gif"},
+            {"url": "https://giphy.com/gif2.gif"},
         ],
     }
 
@@ -51,28 +51,28 @@ async def test_index(client):
 async def test_index_no_data(client):
     giphy_client_mock = mock.AsyncMock(spec=GiphyClient)
     giphy_client_mock.search.return_value = {
-        'data': [],
+        "data": [],
     }
 
     with app.container.giphy_client.override(giphy_client_mock):
-        response = await client.get('/')
+        response = await client.get("/")
 
     assert response.status_code == 200
     data = response.json()
-    assert data['gifs'] == []
+    assert data["gifs"] == []
 
 
 @pytest.mark.asyncio
 async def test_index_default_params(client):
     giphy_client_mock = mock.AsyncMock(spec=GiphyClient)
     giphy_client_mock.search.return_value = {
-        'data': [],
+        "data": [],
     }
 
     with app.container.giphy_client.override(giphy_client_mock):
-        response = await client.get('/')
+        response = await client.get("/")
 
     assert response.status_code == 200
     data = response.json()
-    assert data['query'] == app.container.config.default.query()
-    assert data['limit'] == app.container.config.default.limit()
+    assert data["query"] == app.container.config.default.query()
+    assert data["limit"] == app.container.config.default.limit()