diff --git a/tools/boostbook b/tools/boostbook
index 67a527d63a..a25bf63826 160000
--- a/tools/boostbook
+++ b/tools/boostbook
@@ -1 +1 @@
-Subproject commit 67a527d63a1869247e273dc89cb409b8c3d32e39
+Subproject commit a25bf63826e44cfcc99effe44e13505d63c806f7