diff --git a/greent/requirements.txt b/greent/requirements.txt
index e4c6eefe..ca92706b 100644
--- a/greent/requirements.txt
+++ b/greent/requirements.txt
@@ -62,7 +62,7 @@ pyparsing==2.2.0
 python-dateutil==2.6.1
 python-termstyle==0.1.10
 pytz==2017.2
-PyYAML==3.12
+PyYAML==5.4
 pyzmq==16.0.2
 qtconsole==4.3.1
 rdflib==4.2.2