diff --git a/book/external/Nested-Books b/book/external/Nested-Books
index a8e57da..134fcc3 160000
--- a/book/external/Nested-Books
+++ b/book/external/Nested-Books
@@ -1 +1 @@
-Subproject commit a8e57da25302d47806ad1fe4288950c438562199
+Subproject commit 134fcc3384f0e01591881b59265a58b4eeee849b