diff --git a/requirements.txt b/requirements.txt
index b8a4369..e30af16 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ MarkupSafe==1.0
 mkdocs==0.16.3
 packaging==16.8
 pyparsing==2.2.0
-PyYAML==3.12
+PyYAML==5.4
 singledispatch==3.4.0.3
 six==1.10.0
 tornado==4.5.1