diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 3719dcd..b070849
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,7 +36,7 @@ pandas==0.22.0
 pexpect==4.0.1
 Pillow==3.1.2
 pkg-resources==0.0.0
-protobuf==3.5.2
+protobuf==3.18.3
 psutil==3.4.2
 ptyprocess==0.5
 pycups==1.9.73