diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index 5270dc41..b7216854
--- a/requirements.txt
+++ b/requirements.txt
@@ -88,7 +88,7 @@ pysam==0.13
 python-dateutil==2.7.2
 python-docx==0.8.6
 pytz==2017.3
-PyYAML==3.13
+PyYAML==5.4
 pyzmq==17.1.0
 qtconsole==4.3.1
 ratelimiter==1.2.0.post0