diff --git a/tools/boostbook b/tools/boostbook
index 5efbdc20b8..50db69f7e5 160000
--- a/tools/boostbook
+++ b/tools/boostbook
@@ -1 +1 @@
-Subproject commit 5efbdc20b8c943195a2fffa25f4fb843d23f28bb
+Subproject commit 50db69f7e518bdb3c84ba815802c8c684827a9c4