diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index d3f9001..d659739 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit d3f900177406debf040e5c8e6b6945d047444f5d
+Subproject commit d659739766119a7065f8fe1424874ff935de14cb