diff --git a/antarest/utils.py b/antarest/utils.py
index c0ecffbcca..c1a6c9166c 100644
--- a/antarest/utils.py
+++ b/antarest/utils.py
@@ -20,17 +20,9 @@
 import uvicorn  # type: ignore
 from fastapi import FastAPI
 from ratelimit import RateLimitMiddleware  # type: ignore
-from ratelimit import RateLimitMiddleware  # type: ignore
-from ratelimit.backends.redis import RedisBackend  # type: ignore
-from ratelimit.backends.redis import RedisBackend  # type: ignore
-from ratelimit.backends.redis import RedisBackend  # type: ignore
 from ratelimit.backends.redis import RedisBackend  # type: ignore
 from ratelimit.backends.simple import MemoryBackend  # type: ignore
-from ratelimit.backends.simple import MemoryBackend  # type: ignore
-from ratelimit.backends.simple import MemoryBackend  # type: ignore
-from ratelimit.backends.simple import MemoryBackend  # type: ignore
-from sqlalchemy import create_engine  # type: ignore
-from sqlalchemy import create_engine  # type: ignore
+from sqlalchemy import create_engine
 from sqlalchemy.engine.base import Engine  # type: ignore
 from sqlalchemy.pool import NullPool  # type: ignore