diff --git a/themes/hugo-book b/themes/hugo-book
index 836a8a8..b7f9c8c 160000
--- a/themes/hugo-book
+++ b/themes/hugo-book
@@ -1 +1 @@
-Subproject commit 836a8a82d660c673b6705bdb5c7d79a262b65981
+Subproject commit b7f9c8cb0f51523f316777a27abba64b10e247f5