diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 319f5a3..a3ffb02
--- a/requirements.txt
+++ b/requirements.txt
@@ -176,7 +176,7 @@ prompt-toolkit==2.0.7
 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==3.6.1
+protobuf==3.18.3
 psutil==5.4.8
 ptyprocess==0.6.0
 py==1.7.0