diff --git a/requirements.txt b/requirements.txt
index 369bc90..f3987f8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 Jinja2==2.7.3
 MarkupSafe==0.23
-PyYAML==3.11
+PyYAML==5.4
 Pygments==2.0.1
 Sphinx==1.2.3
 binaryornot==0.3.0