diff --git a/requirements.txt b/requirements.txt
index f6e9d12..9547ab6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ pyrsistent==0.16.0
 python-dateutil==2.7.5
 pytz==2018.7
 pywin32==228
-PyYAML==3.13
+PyYAML==5.1
 pyzmq==19.0.1
 SALib==1.3.11
 scikit-learn==0.20.2