diff --git a/requirements.txt b/requirements.txt
index 1bf39b4..52b6295 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -123,7 +123,7 @@ python-dateutil==2.7.5
 python-jose==2.0.2
 pytorch-pretrained-bert==0.3.0
 pytz==2017.3
-PyYAML==5.1
+PyYAML==5.4
 pyzmq==17.1.2
 qtconsole==4.4.1
 regex==2018.1.10