diff --git a/docs/requirements.txt b/docs/requirements.txt
index 04ac75ac..6d761fac 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,7 @@
 
 ipykernel
 ipython
+ipywidgets
 jupytext
 nbconvert
 nbsphinx