diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index a0641b2e..6aa57618
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ netifaces==0.10.6
 pcapy==0.11.1
 pep8==1.7.1
 pep8-naming>=0.3.3
-protobuf==3.3.0
+protobuf==3.18.3
 protobuf-to-dict==0.1.0
 pyflakes==1.6.0
 pylint==1.7.6