diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 9d8dd24..9ad0012
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ Markdown==3.0.1
 msgpack==0.6.0
 mpi4py==3.0.1
 numpy==1.14.5
-protobuf==3.6.1
+protobuf==3.15.0
 pyasn1==0.4.5
 pyasn1-modules==0.2.3
 pytz==2018.9