diff --git a/requirements.txt b/requirements.txt
index 4c8fd88..d9a0a6a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ pytest-pylint==0.14.1
 python-dateutil==2.8.0
 pytz==2019.2
 pywinpty==0.5.5
-PyYAML==5.1.1
+PyYAML==5.4
 pyzmq==18.1.0
 rdflib==4.2.2
 rdflib-jsonld==0.4.0