diff --git a/requirements.txt b/requirements.txt
index 4ab7a6c..1c8beb8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ numpy==1.18.2
 oauth2client==4.1.3
 oauthlib==3.1.0
 pandas==1.0.3
-protobuf==3.11.3
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 python-dateutil==2.8.1