diff --git a/tools/boostbook b/tools/boostbook
index 7d32695586..c42075541b 160000
--- a/tools/boostbook
+++ b/tools/boostbook
@@ -1 +1 @@
-Subproject commit 7d3269558686162e950e2ad3995733aa896048c4
+Subproject commit c42075541b76e9d0e8062e3a61b6eeb2372f881b