diff --git a/docs/themes/hugo-book b/docs/themes/hugo-book
index 7c26d9b..2f64607 160000
--- a/docs/themes/hugo-book
+++ b/docs/themes/hugo-book
@@ -1 +1 @@
-Subproject commit 7c26d9b8b731d556a2bf89848f59e8300eabc44b
+Subproject commit 2f64607bc9a4caa6ffc4ed7f614c8ad9a5b6611c