diff --git a/src/core/app.py b/src/core/app.py
index 40bfea9..1110fbd 100644
--- a/src/core/app.py
+++ b/src/core/app.py
@@ -1,4 +1,5 @@
 from fastapi import FastAPI
+from fastapi.responses import ORJSONResponse
 
 import aioredis
 from fastapi_pagination import add_pagination
@@ -10,7 +11,7 @@ from core.db import database
 
 
 def start_app() -> FastAPI:
-    app = FastAPI()
+    app = FastAPI(default_response_class=ORJSONResponse)
 
     app.include_router(users_router)
     app.include_router(languages_router)