diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index f01b079..324e657 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit f01b079269f43edb557c4551805e46b1430e9d71
+Subproject commit 324e657ae2261761677e4b0c72256e1e85685ad2