diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 76a999c..9b54e59
--- a/requirements.txt
+++ b/requirements.txt
@@ -44,7 +44,7 @@ Pygments==2.2.0
 pyparsing==2.2.0
 python-dateutil==2.6.1
 pytz==2017.3
-PyYAML==3.12
+PyYAML==5.4
 regex==2017.4.5
 requests==2.18.4
 scipy==1.0.0