diff --git a/tools/boostbook b/tools/boostbook
index d108e4d24a..c220a12c17 160000
--- a/tools/boostbook
+++ b/tools/boostbook
@@ -1 +1 @@
-Subproject commit d108e4d24ac012e14e9aff06aadf13065ea939d7
+Subproject commit c220a12c17f6b9689d4cd7efce58736c591481d6