diff --git a/pip-sample/requirements.txt b/pip-sample/requirements.txt
index 680d08166..c585fe089 100644
--- a/pip-sample/requirements.txt
+++ b/pip-sample/requirements.txt
@@ -38,7 +38,7 @@ parso==0.3.1
 pexpect==4.6.0
 pickleshare==0.7.5
 prometheus-client==0.3.1
-protobuf==3.6.1
+protobuf==3.18.3
 protobuf-to-dict==0.1.0
 ptyprocess==0.6.0
 Pygments==2.2.0