diff --git a/requirements.txt b/requirements.txt
index 0a84185..0d5b0a1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ pandas==0.24.2
 pyparsing==2.4.0
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 scikit-learn==0.21.2
 scipy==1.3.0
 six==1.12.0