diff --git a/hecl/extern/boo b/hecl/extern/boo
index 7b329963d..5c91ba8da 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 7b329963d1f488664b1156197aef326a476b29a3
+Subproject commit 5c91ba8da7951b2b039da5fb07cf5dcd49be2790