diff --git a/requirements.txt b/requirements.txt
index 94c5312..1618d57 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -20,7 +20,7 @@ protobuf==3.6.1
 pyparsing==2.3.0
 python-datamuse==1.2.1
 python-dateutil==2.7.5
-PyYAML==5.1
+PyYAML==5.4
 requests==2.21.0
 scikit-learn==0.20.2
 scipy==1.1.0