diff --git a/requirements.txt b/requirements.txt
index 200fde5..66f7004 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@ Pygments==2.4.2
 pyrsistent==0.15.2
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.2
 qtconsole==4.5.1
 requests==2.22.0