diff --git a/doc/requirements-doc.txt b/doc/requirements-doc.txt
index 818e570e2..b8ee6b358 100644
--- a/doc/requirements-doc.txt
+++ b/doc/requirements-doc.txt
@@ -23,4 +23,3 @@ flask
 uvicorn
 pygments
 werkzeug
-cloudpickle
diff --git a/python/ray/experimental/serve/kv_store_service.py b/python/ray/experimental/serve/kv_store_service.py
index 423c572f7..05f8cb138 100644
--- a/python/ray/experimental/serve/kv_store_service.py
+++ b/python/ray/experimental/serve/kv_store_service.py
@@ -2,7 +2,7 @@ import json
 import sqlite3
 from abc import ABC
 
-import cloudpickle as pickle
+from ray import cloudpickle as pickle
 
 import ray.experimental.internal_kv as ray_kv
 from ray.experimental.serve.utils import logger