diff --git a/docs/docs_require.txt b/docs/docs_require.txt
index 1b17efcca..99c479326 100644
--- a/docs/docs_require.txt
+++ b/docs/docs_require.txt
@@ -3,6 +3,7 @@ future
 h5py
 holoviews
 ipyparallel
+ipywidgets
 matplotlib
 numpy
 numpydoc