diff --git a/requirements.txt b/requirements.txt
index c45e0d7..be8a263 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -34,7 +34,7 @@ psutil==4.2.0
 ptyprocess==0.5
 python-dateutil==2.4.2
 pytz==2015.7
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==14.7.0
 requests==2.8.1
 scipy==0.16.1