diff --git a/requirements.txt b/requirements.txt
index 8228e51..30c964b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -58,7 +58,7 @@ python-dateutil==2.8.0
 python-engineio==3.8.1
 python-socketio==4.1.0
 pytz==2018.5
-PyYAML==5.1.1
+PyYAML==5.4
 requests==2.19.1
 s3transfer==0.2.1
 scipy==1.3.0