diff --git a/requirements.txt b/requirements.txt
index 389e616..c161095 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ protobuf==3.7.1
 pyparsing==2.3.1
 python-dateutil==2.8.0
 pytz==2018.9
-PyYAML==5.1
+PyYAML==5.4
 requests==2.21.0
 s3transfer==0.2.0
 scikit-learn==0.20.3