diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 242bf1ec..5b1ac545
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ pexpect==4.6.0
 pickleshare==0.7.5
 plotly==3.5.0
 prompt-toolkit==2.0.7
-protobuf==3.6.1
+protobuf==3.15.0
 ptyprocess==0.6.0
 pycparser==2.19
 Pygments==2.3.1