diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 76a999c..c23476a
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ pickleshare==0.7.4
 plac==0.9.6
 preshed==1.0.0
 prompt-toolkit==1.0.14
-protobuf==3.5.0.post1
+protobuf==3.15.0
 psutil==5.4.2
 ptyprocess==0.5.2
 Pygments==2.2.0