diff --git a/sipi-app/main.py b/sipi-app/main.py
index 7f8522c..2e00377 100644
--- a/sipi-app/main.py
+++ b/sipi-app/main.py
@@ -7,6 +7,7 @@ from api import router as api_router
 import uvicorn
 from fastapi import FastAPI
 
+from fastapi.responses import ORJSONResponse
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
@@ -14,6 +15,7 @@ async def lifespan(app: FastAPI):
     await db_helper.dispose()
 
 main_app = FastAPI(
+    default_response_class=ORJSONResponse,
     lifespan=lifespan,
 )