diff --git a/requirements.txt b/requirements.txt
index 7922496..a324d7b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -73,7 +73,7 @@ pyrsistent==0.14.11
 python-dateutil==2.8.0
 pytz==2018.9
 PyWavelets==1.0.2
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==18.0.1
 qtconsole==4.4.3
 requests==2.21.0