diff --git a/examples/cinc17/entry/requirements.txt b/examples/cinc17/entry/requirements.txt
index 221efbd9..9b4a6340 100644
--- a/examples/cinc17/entry/requirements.txt
+++ b/examples/cinc17/entry/requirements.txt
@@ -16,7 +16,7 @@ mock==2.0.0
 numpy==1.14.3
 pbr==4.0.4
 pip==10.0.1
-protobuf==3.15.0
+protobuf==3.18.3
 PyYAML==3.12
 setuptools==39.2.0
 scipy==1.1.0