diff --git a/themes/hugo-book b/themes/hugo-book
index 3f1bccc..2dffe0b 160000
--- a/themes/hugo-book
+++ b/themes/hugo-book
@@ -1 +1 @@
-Subproject commit 3f1bcccbfb247da44ab5410a97576c0bf6da103b
+Subproject commit 2dffe0bc7a5caac3e49bf2abe943ca412d5f4333