diff --git a/external/book b/external/book
index cdb5d19301ad7757272342933430dfbaaf6acec7..3d2268e7d22cfdcc15f08d6d87bc6a3415178bca 160000
--- a/external/book
+++ b/external/book
@@ -1 +1 @@
-Subproject commit cdb5d19301ad7757272342933430dfbaaf6acec7
+Subproject commit 3d2268e7d22cfdcc15f08d6d87bc6a3415178bca