diff --git a/requirements.txt b/requirements.txt
index 773415ab..a0886285 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ grpcio==1.41.0
 idna==3.2; python_version >= '3'
 msgpack==1.0.2
 numpy==1.21.2; python_version < '3.9'
-protobuf==3.18.0
+protobuf==4.22.0
 psutil==5.8.0
 pyyaml==5.4.1; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'
 ray==1.6.0