diff --git a/pyproject.toml b/pyproject.toml
index b994159e..988c6a8e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ docs = [
     "sphinx>=5,<9",
     "sphinx_design==0.7.0",
     "myst-nb==1.4.0",
-    "sphinx-book-theme==1.2.0",
+    "sphinx-book-theme==1.4.0",
     "sphinx-argparse==0.6.0",
     "sphinx-toolbox==4.2.0",
 ]