diff --git a/docs/requirements.txt b/docs/requirements.txt
index b37591845f..b30f7a5b2a 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -28,3 +28,4 @@ ply
 psutil
 ws4py
 Jinja2==3.1.2
+PyYaml