diff --git a/requirements.txt b/requirements.txt
index d004bc7..9906d83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ google-resumable-media==0.5.0
 googleapis-common-protos==1.51.0
 idna==2.9
 multidict==4.7.5
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pytz==2019.3