diff --git a/requirements.txt b/requirements.txt
index 511c3d3..ac3447b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ google-resumable-media==0.3.2
 googleapis-common-protos==1.6.0
 idna==2.8
 pprint==0.1
-protobuf==3.18.3
+protobuf==3.20.3
 pyasn1==0.4.5
 pyasn1-modules==0.2.5
 pytz==2019.1