diff --git a/requirements.txt b/requirements.txt
index 599600f..3d2bd2b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -61,7 +61,7 @@ pyparsing==2.4.0
 pyrsistent==0.15.3
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.2
 requests==2.22.0
 rfc3987==1.3.8