diff --git a/requirements.txt b/requirements.txt
index f2bb99c..4c9b1a5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ oauth2client==4.1.3
 packaging==20.4
 pep8==1.7.1
 pluggy==0.13.1
-protobuf==3.13.0
+protobuf==3.18.3
 py==1.9.0
 pyAesCrypt==0.4.3
 pyasn1==0.4.8