diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index d66be66..c4448a3 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit d66be663197bcc3e0b371d867126d6693ec8045c
+Subproject commit c4448a3a9f9f5bb81eaa03fe467b98b5b96b403e