diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index e46d498c..10898930
--- a/requirements.txt
+++ b/requirements.txt
@@ -63,7 +63,7 @@ pyparsing==2.4.5
 pyrsistent==0.15.6
 python-dateutil==2.8.1
 pytz==2019.3
-PyYAML==5.2
+PyYAML==5.4
 pyzmq==18.1.1
 qtconsole==4.6.0
 requests==2.22.0