diff --git a/docs/requirements.txt b/docs/requirements.txt
index 56bbcfb..21fd866 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -17,7 +17,7 @@ Pygments==2.4.2
 pyparsing==2.4.0
 python-dateutil==2.8.0
 pytz==2019.1
-PyYAML==5.1.1
+PyYAML==5.4
 requests==2.22.0
 restructuredtext-lint==1.3.0
 ruamel.yaml==0.15.97