diff --git a/requirements.txt b/requirements.txt
index b269805..6da37e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -77,7 +77,7 @@ pyrsistent==0.15.4
 python-dateutil==2.8.0
 python-igraph==0.7.1.post6
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.1.0
 requests==2.22.0
 scikit-learn==0.21.3