diff --git a/luigi/requirements.txt b/luigi/requirements.txt
old mode 100755
new mode 100644
index 74dca85..e47875d
--- a/luigi/requirements.txt
+++ b/luigi/requirements.txt
@@ -77,7 +77,7 @@ python-igraph==0.7.1.post6
 python-telegram-bot==9.0.0
 pytz==2017.3
 pyxdg==0.25
-PyYAML==3.12
+PyYAML==5.4
 pyzmq==16.0.3
 qtconsole==4.3.1
 reportbug==7.1.8