diff --git a/openslides/utils/redis.py b/openslides/utils/redis.py
index e96dd68a2..9744ee5fe 100644
--- a/openslides/utils/redis.py
+++ b/openslides/utils/redis.py
@@ -1,7 +1,6 @@
 import asyncio
 from typing import Any
 
-from channels_redis.core import ConnectionPool
 from django.conf import settings
 
 from . import logging
@@ -14,14 +13,16 @@ try:
 except ImportError:
     use_redis = False
 else:
+    from channels_redis.core import ConnectionPool
+
     # set use_redis to true, if there is a value for REDIS_ADDRESS in the settings
     redis_address = getattr(settings, "REDIS_ADDRESS", "")
     use_redis = bool(redis_address)
     if use_redis:
         logger.info(f"Redis address {redis_address}")
 
-pool = ConnectionPool({"address": redis_address})
-counter = 0
+    pool = ConnectionPool({"address": redis_address})
+    counter = 0
 
 
 class RedisConnectionContextManager:
diff --git a/requirements/big_mode.txt b/requirements/big_mode.txt
index 456525859..4b89a3b1f 100644
--- a/requirements/big_mode.txt
+++ b/requirements/big_mode.txt
@@ -6,4 +6,4 @@ aioredis>=1.1.0,<1.3
 
 # Requirements for fast asgi server
 gunicorn>=19.9.0,<20
-uvicorn>=0.3.2,<1.1
+uvicorn>=0.9,<1.0
diff --git a/requirements/production.txt b/requirements/production.txt
index cb9e07044..76231f0d9 100644
--- a/requirements/production.txt
+++ b/requirements/production.txt
@@ -15,3 +15,4 @@ PyPDF2>=1.26,<1.27
 roman>=2.0,<3.2
 setuptools>=29.0,<42.0
 typing_extensions>=3.6.6,<3.8
+websockets>=8.0,<9.0
\ No newline at end of file