diff --git a/requirements.txt b/requirements.txt
index f495e44..c87443b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ protobuf==3.9.1
 pyarrow==0.14.1
 python-dateutil==2.8.0
 pytz==2019.2
-PyYAML==5.1.2
+PyYAML==5.4
 scikit-learn==0.21.3
 scipy==1.3.1
 six==1.12.0