diff --git a/dendronet_legacy/requirements.txt b/dendronet_legacy/requirements.txt
index cda78a0..aa613b4 100644
--- a/dendronet_legacy/requirements.txt
+++ b/dendronet_legacy/requirements.txt
@@ -75,7 +75,7 @@ python-dateutil==2.6.1
 python-debian==0.1.32
 pytz==2018.3
 pyxdg==0.25
-PyYAML==3.12
+PyYAML==5.4
 pyzmq==16.0.2
 reportlab==3.4.0
 requests==2.18.4