diff --git a/themes/hugo-book b/themes/hugo-book
index 915477e..9a9f492 160000
--- a/themes/hugo-book
+++ b/themes/hugo-book
@@ -1 +1 @@
-Subproject commit 915477e52753317cf857aba1f27ced344800c1b6
+Subproject commit 9a9f4925d610629a535a8b65b73b2aa95eeec89c