diff --git a/requirements.txt b/requirements.txt
index da341ff..2fcad68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -76,7 +76,7 @@ pytest==5.0.1
 pytest-cov==2.7.1
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.2
 qtconsole==4.5.1
 requests==2.22.0