diff --git a/mlflow/requirements.txt b/mlflow/requirements.txt
index a2bdcf7b..864251d8 100644
--- a/mlflow/requirements.txt
+++ b/mlflow/requirements.txt
@@ -71,7 +71,7 @@ pyrsistent==0.15.7
 python-dateutil==2.8.1
 python-editor==1.0.4
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.1.1
 qtconsole==4.6.0
 querystring-parser==1.2.4