diff --git a/requirements.txt b/requirements.txt
index 351c814..6ad2cc0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ mypy-extensions==0.4.3
 oauth2client==4.1.3
 oauthlib==3.1.0
 proto-plus==1.9.1
-protobuf==3.13.0
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pylint==2.6.0