diff --git a/cmd/suggestion/hyperband/v1beta1/requirements.txt b/cmd/suggestion/hyperband/v1beta1/requirements.txt
index 6677b67f90e..e28906e8534 100644
--- a/cmd/suggestion/hyperband/v1beta1/requirements.txt
+++ b/cmd/suggestion/hyperband/v1beta1/requirements.txt
@@ -4,5 +4,5 @@ numpy>=1.13.3
 scikit-learn>=0.19.0
 scipy>=0.19.1
 forestci==0.3
-protobuf==3.9.1
+protobuf==4.22.0
 googleapis-common-protos==1.6.0