diff --git a/requirements-doc.txt b/requirements-doc.txt
index f4d7f99..ae6c1cd 100644
--- a/requirements-doc.txt
+++ b/requirements-doc.txt
@@ -8,7 +8,7 @@ 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>=0.5.0
 sphinx-remove-toctrees
 jupyter-sphinx>=0.5.3