diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index fd06f98..887a1c5 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit fd06f9871aec3cbb255f3724dc9be77fd8b45ae3
+Subproject commit 887a1c5a4e9955555bb1437cf1b4e05861290572