diff --git a/requirements.txt b/requirements.txt
index ba7e174e3ca4551175c76fffd5907ef95ef41681..94448ba13b48e13b897d36a3d2fc239e9cea1d09 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,3 @@
 jupyter-book
 dtumathtools
+sphinx_toolbox