diff --git a/requirements.txt b/requirements.txt
index 3e43af7..870a4e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -53,7 +53,7 @@ pyparsing==2.4.0
 pyrsistent==0.15.2
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.1
 qtconsole==4.5.1
 scikit-learn==0.21.2