diff --git a/chat/client-libraries/cloud/requirements.txt b/chat/client-libraries/cloud/requirements.txt
index bf63a182..25e34548 100644
--- a/chat/client-libraries/cloud/requirements.txt
+++ b/chat/client-libraries/cloud/requirements.txt
@@ -1,3 +1,3 @@
 google_auth_oauthlib==1.2.0
-protobuf==4.21.12
+protobuf==5.29.6
 google-apps-chat==0.1.9