diff --git a/scripts/parallel-client.py b/scripts/parallel-client.py
index 5394cc2..6d5b5de 100644
--- a/scripts/parallel-client.py
+++ b/scripts/parallel-client.py
@@ -27,7 +27,6 @@
 import requests
 import numpy as np
 import ssl
-import sys
 import time
 import urllib3
 
@@ -265,7 +264,10 @@ async def run_async_httpx(args):
 
 
 def main():
-    urllib3.disable_warnings(urllib3.exceptions.SubjectAltNameWarning)
+    try:
+        urllib3.disable_warnings(urllib3.exceptions.SubjectAltNameWarning)
+    except:
+        pass
     args = get_args()
     start = time.time()
     num_errors = 0
diff --git a/scripts/requirements.txt b/scripts/requirements.txt
index 7b421ce..4d5f977 100644
--- a/scripts/requirements.txt
+++ b/scripts/requirements.txt
@@ -2,3 +2,4 @@ numcodecs
 numpy
 requests
 s3fs
+httpx