diff --git a/hecl/extern/boo b/hecl/extern/boo
index 55d1a5bc9..db9a5953e 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 55d1a5bc931956ba467a3e3eb3ceaaf896929c1a
+Subproject commit db9a5953e645c6c06ab314625dafda17389860f1