diff --git a/requirements.txt b/requirements.txt
index 350e198..1426785 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ idna==3.2
 oauth2client==4.1.3
 oauthlib==3.1.1
 packaging==21.0
-protobuf==3.17.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pyparsing==2.4.7