diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index a17b284..b5c1bf9 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit a17b28450b0a15f7a353f99b0d99061ff4babecf
+Subproject commit b5c1bf9ca8f741de07a24eb4990f2a7f266244b7