diff --git a/hecl/extern/boo b/hecl/extern/boo
index 8523fcbb7..56439646b 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 8523fcbb78b116ec50952dfdd66931af64837734
+Subproject commit 56439646b29222cf1331714e87b3f4df695a926e