diff --git a/themes/book b/themes/book
index 4ef38f3..c024538 160000
--- a/themes/book
+++ b/themes/book
@@ -1 +1 @@
-Subproject commit 4ef38f3bbf5dae9a11a711d2ed1ced9294c6af5f
+Subproject commit c02453860408509b714c5e853457b66ef07712fc