diff --git a/dev_server/requirements.txt b/dev_server/requirements.txt
index 0b26095..4f91889 100644
--- a/dev_server/requirements.txt
+++ b/dev_server/requirements.txt
@@ -55,7 +55,7 @@ pyparsing==2.4.2
 pyrsistent==0.15.4
 python-dateutil==2.8.0
 pytz==2019.3
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.1.0
 qtconsole==4.5.5
 scikit-learn==0.21.3