diff --git a/requirements.txt b/requirements.txt
index 74e0f44..8a2fa07 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,6 +19,6 @@ zipp>=4.1.0 # not directly required, pinned by Snyk to avoid a vulnerability
 myst-parser==5.1.0
 sphinx-copybutton==0.5.2
 sphinx_design==0.6.1
-sphinx-book-theme==1.2.0
+sphinx-book-theme==1.4.0
 sphinx-sitemap==2.9.0
 sphinxext-opengraph==0.13.0