diff --git a/requirements.txt b/requirements.txt
index 0936390..f5408d8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -60,7 +60,7 @@ pyrsistent==0.16.0
 pystan==2.19.1.1
 python-dateutil==2.8.1
 pytz==2020.1
-PyYAML==5.3.1
+PyYAML==5.4
 pyzmq==19.0.2
 scikit-learn==0.23.2
 scipy==1.5.2