diff --git a/requirements.txt b/requirements.txt
index e244ad5..c9bcc64 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ protobuf==3.6.0
 pyparsing==2.2.0
 python-dateutil==2.7.3
 pytz==2018.5
-PyYAML==5.1
+PyYAML==5.4
 scikit-learn==0.20.0
 scipy==1.1.0
 six==1.11.0