diff --git a/test/requirements.ci.txt b/test/requirements.ci.txt
index 34adc9b8..8b30edad 100644
--- a/test/requirements.ci.txt
+++ b/test/requirements.ci.txt
@@ -4,5 +4,5 @@ websocket-client==0.57.0
 urllib3==1.26.9
 docker-compose==1.27.4
 grpcio==1.46.3
-protobuf==3.20.1
+protobuf==4.21.0