diff --git a/setup.py b/setup.py
index 9844916..7a86a00 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
         "grpc-powergate-client==2.1.0",
         "grpcio==1.35.0",
         "mypy-extensions==0.4.3",
-        "protobuf==3.15.1",
+        "protobuf==3.18.3",
         "six==1.15.0",
         "wrapt==1.12.1",
     ],