diff --git a/tools/Hamud_Book b/tools/Hamud_Book
index 2240f7a0..231cfb83 160000
--- a/tools/Hamud_Book
+++ b/tools/Hamud_Book
@@ -1 +1 @@
-Subproject commit 2240f7a071b0fd283d6c1086e0727a1fda6ec2d0
+Subproject commit 231cfb830d43ff7bb65cab1922ba8c03e257ac97