diff --git a/requirements.txt b/requirements.txt
index 28fbbbb..e918c0c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ oauth2client==4.1.3
 oauthlib==3.1.0
 packaging==20.4
 pluggy==0.13.1
-protobuf==3.11.3
+protobuf==3.18.3
 py==1.9.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8