diff --git a/drachma/requirements.txt b/drachma/requirements.txt
index 81ef1ec..582b206 100644
--- a/drachma/requirements.txt
+++ b/drachma/requirements.txt
@@ -47,7 +47,7 @@ pyrsistent==0.15.6
 pystardog==0.9.6
 python-dateutil==2.8.1
 pytz==2019.3
-PyYAML==5.2
+PyYAML==5.4
 pyzmq==18.1.1
 qtconsole==4.6.0
 requests==2.22.0