diff --git a/doc_requirements.txt b/doc_requirements.txt
index a72da62..a37f146 100644
--- a/doc_requirements.txt
+++ b/doc_requirements.txt
@@ -2,7 +2,7 @@ Jinja2==2.7.3
 MarkupSafe==0.23
 Peon==0.2.1
 PyJWT==0.2.1
-PyYAML==3.11
+PyYAML==5.1
 Pygments==1.6
 Sphinx==1.2.2
 Unidecode==0.04.16