diff --git a/requirements.txt b/requirements.txt
index 615f3703..61c23c2e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ pyparsing==2.4.0
 PySocks==1.7.0
 python-dateutil==2.8.0
 pytz==2019.2
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.0.2
 rdflib==4.2.2
 requests==2.22.0