diff --git a/requirements.txt b/requirements.txt
index 96d26ad..a7c1c8a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ pyasn1==0.4.8
 Pygments==2.5.2
 pyrsistent==0.15.6
 python-dateutil==2.8.0
-PyYAML==5.1.2
+PyYAML==5.4
 pyzmq==18.1.1
 rsa==3.4.2
 s3transfer==0.2.1