diff --git a/metrics/handler/requirements.txt b/metrics/handler/requirements.txt
index 9026d1daf..5741eedb6 100644
--- a/metrics/handler/requirements.txt
+++ b/metrics/handler/requirements.txt
@@ -5,7 +5,7 @@ google-cloud-secret-manager==2.1.0
 importlib-metadata~=6.0.0
 jinja2>=3.0
 numpy~=1.23.0
-protobuf==3.15.0
+protobuf==3.18.3
 sendgrid==6.4.8
 tensorboard~=2.9.0
 tensorflow-cpu~=2.9.1