diff --git a/requirements/multiple_category_classification_keras.txt b/requirements/multiple_category_classification_keras.txt
index df32bde..a70c3d2 100644
--- a/requirements/multiple_category_classification_keras.txt
+++ b/requirements/multiple_category_classification_keras.txt
@@ -59,7 +59,7 @@ pyparsing==2.4.2
 pyrsistent==0.15.4
 python-dateutil==2.8.0
 pytz==2019.2
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.0.2
 qtconsole==4.5.2
 requests==2.22.0