diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index e849899..d66be66 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit e8498996d087993e30f5cf95cbf099f924263194
+Subproject commit d66be663197bcc3e0b371d867126d6693ec8045c