diff --git a/requirements.txt b/requirements.txt
index a8d2916..2e6e9c4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -71,7 +71,7 @@ pyparsing==2.2.0
 PySocks==1.6.8
 python-dateutil==2.7.3
 pytz==2018.5
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==17.1.2
 requests==2.20.0
 scikit-learn==0.19.1