diff --git a/hugo/themes/book b/hugo/themes/book
index 317ccae..5e15ddb 160000
--- a/hugo/themes/book
+++ b/hugo/themes/book
@@ -1 +1 @@
-Subproject commit 317ccae23b73f5e49d7341ad57227bd64a89ab38
+Subproject commit 5e15ddb4f430cd9ded6bf232ede14d468ccb41f1