diff --git a/themes/book b/themes/book
index d5b75f4f..f8a0fc4e 160000
--- a/themes/book
+++ b/themes/book
@@ -1 +1 @@
-Subproject commit d5b75f4fb3aaa5c2f0209db4933a55aa634d5dfd
+Subproject commit f8a0fc4e246c61cea8159d2d2955f488e7d13848