diff --git a/requirements.txt b/requirements.txt
index 4920504..f5d15a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@ pyparsing==2.4.1.1
 pyrsistent==0.15.3
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.2
 scikit-learn
 scipy