diff --git a/requirements.txt b/requirements.txt
index 76a570e..377ef6c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 Jinja2==2.7.2
 MarkupSafe==0.23
-PyYAML==3.11
+PyYAML==5.1
 Pygments==1.6
 Sphinx==1.2.2
 argparse==1.2.1