diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 5f607e1..fa0eee2
--- a/requirements.txt
+++ b/requirements.txt
@@ -62,7 +62,7 @@ pexpect==4.0.1
 Pillow==3.1.2
 pkg-resources==0.0.0
 plainbox==0.25
-protobuf==3.6.1
+protobuf==3.15.0
 psutil==3.4.2
 ptyprocess==0.5
 pyasn1==0.1.9