diff --git a/book b/book
index 0737c13..de25cec 160000
--- a/book
+++ b/book
@@ -1 +1 @@
-Subproject commit 0737c13b1fdc01cbde80ec322e217c7bd053f8e2
+Subproject commit de25cec2c9e452b0a6d8fc380f9aa2fdd9888151