diff --git a/tests/benchmark/milvus_benchmark/update.py b/tests/benchmark/milvus_benchmark/update.py
index 50b5b93422..622175254d 100644
--- a/tests/benchmark/milvus_benchmark/update.py
+++ b/tests/benchmark/milvus_benchmark/update.py
@@ -7,7 +7,6 @@ from yaml import full_load, dump
 import config
 import utils
 import requests
-import json
 
 
 def parse_server_tag(server_tag):