diff --git a/docs/requirements.txt b/docs/requirements.txt
index 01179e9..7140457 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -5,7 +5,7 @@ sphinx>=9.0.4
 myst-nb
 sphinx_thebe
 sphinx-autodoc-typehints
-sphinx-book-theme>=1.2.0
+sphinx-book-theme>=1.4.0
 sphinx-copybutton>=0.5.2
 sphinx-remove-toctrees
 jupyter-sphinx>=0.5.3