diff --git a/backend/deps.py b/backend/deps.py
index 4d10068..785e853 100644
--- a/backend/deps.py
+++ b/backend/deps.py
@@ -16,7 +16,7 @@ def _get_optional_redis(
     if redis_url is None:
         yield None
     else:
-        redis: Redis = Redis.from_url(redis_url)  # type: ignore
+        redis: Redis = Redis.from_url(str(redis_url))  # type: ignore
         try:
             yield redis
         finally: