diff --git a/requirements.txt b/requirements.txt
index 79829fe..cefbc2d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -51,7 +51,7 @@ Pygments==2.4.2
 pyparsing==2.4.2
 pyrsistent==0.15.4
 python-dateutil==2.8.0
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.0.2
 qtconsole==4.5.2
 scikit-learn==0.21.3