diff --git a/tools/boostbook b/tools/boostbook
index 719af2337f..4e5a5ab0d3 160000
--- a/tools/boostbook
+++ b/tools/boostbook
@@ -1 +1 @@
-Subproject commit 719af2337faae26c33a68ed2e424a3afa67486b2
+Subproject commit 4e5a5ab0d364ead933a9a153cadd821940545abe