diff --git a/requirements.txt b/requirements.txt
index e73e428..c1834e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ ply==3.8
 proto-google-cloud-datastore-v1==0.90.4
 proto-google-cloud-error-reporting-v1beta1==0.15.3
 proto-google-cloud-logging-v2==0.91.3
-protobuf==3.4.0
+protobuf==3.18.3
 psutil==5.4.1
 pyasn1==0.3.7
 pyasn1-modules==0.1.5