diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index 4fd4ac2..d1d04d3 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,3 +1,4 @@
+mccube
 jupytext==1.15.0
 myst_nb==0.17.2
 sphinx==5.3.0