diff --git a/tests/python_client/requirements.txt b/tests/python_client/requirements.txt
index d55b1bf17b..5db02cf36d 100644
--- a/tests/python_client/requirements.txt
+++ b/tests/python_client/requirements.txt
@@ -30,3 +30,6 @@ pytest-random-order
 
 # for customize config test
 python-benedict==0.24.3
+
+# version need to be consistent with protobuf used in pymilvus
+protobuf==3.17.1
\ No newline at end of file