diff --git a/requirements.txt b/requirements.txt
index 2a532ad..142b1fe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,3 +11,5 @@ sphinx-apa-references
 myst_nb
 numpy
 matplotlib
+
+git+https://github.com/TeachBooks/Sphinx-Sticky-Margin@first-steps