diff --git a/doc/requirements.txt b/doc/requirements.txt
index b8b8278..4880be4 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -5,6 +5,7 @@ jupyter-sphinx
 nbsphinx
 nbsphinx_link
 sphinx-rtd-theme
+sphinx_design
 # sphinx_plotly_directive
 git+https://github.com/Davide-sd/sphinx-plotly-directive@combine
 sphinx_panel_screenshot