diff --git a/requirements.txt b/requirements.txt
index 5b2be34..be52cac 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,6 +19,7 @@ nbsphinx # for documentation and testing
 numpydoc # for documentation and testing
 sphinx-automodapi # for documentation and testing
 sphinx-gallery # for documentation and testing
+sphinx-material # for documentation and testing
 black
 isort
 tox