diff --git a/book-monads b/book-monads
index d430fd9..3ff695d 160000
--- a/book-monads
+++ b/book-monads
@@ -1 +1 @@
-Subproject commit d430fd9dca7e7ba7475f8be469c2eecb241c0def
+Subproject commit 3ff695d815a2d8a20d9eb238800be414d2881ab0