diff --git a/build/requirements.txt b/build/requirements.txt
index 5e9bbe3..645178b 100644
--- a/build/requirements.txt
+++ b/build/requirements.txt
@@ -75,7 +75,7 @@ PySocks==1.6.8
 pytest==4.1.1
 python-dateutil==2.8.0
 pytz==2018.9
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==18.0.1
 qtconsole==4.4.3
 recommonmark==0.5.0