diff --git a/requirements.txt b/requirements.txt
index f24d8db..34e9239 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 cfn-flip==1.2.2
 click==7.1.1
-PyYAML==5.3.1
+PyYAML==5.4
 six==1.14.0
 troposphere==2.6.0