diff --git a/requirements.txt b/requirements.txt
index c9ee365..48524e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ protobuf==3.8.0
 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