diff --git a/hecl/extern/boo b/hecl/extern/boo
index 3b4d7abae..b6d40fde9 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 3b4d7abae6dc0d11cefa6b3aaf545bff90963ce4
+Subproject commit b6d40fde97a4d2cafd4dd15bb8300cd62154484a