diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index cf301b2..d66be66 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit cf301b2d05cc065cbb589ae3b9558c606abd5b50
+Subproject commit d66be663197bcc3e0b371d867126d6693ec8045c