diff --git a/docs/requirements.txt b/docs/requirements.txt
index a8c1ea3c..d03af1f3 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -64,7 +64,7 @@ PySocks==1.6.7
 pytest==3.1.2
 python-dateutil==2.6.1
 pytz==2017.2
-PyYAML==3.12
+PyYAML==5.4
 pyzmq==16.0.3
 scikit-learn==0.19.1
 scipy==1.0.0