diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 79490e8..691dbda
--- a/requirements.txt
+++ b/requirements.txt
@@ -103,7 +103,7 @@ python-dateutil==2.8.0
 python-editor==1.0.4
 pytz==2018.9
 PyWavelets==1.0.3
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.0.1
 qtconsole==4.5.1
 queuelib==1.5.0