diff --git a/hecl/extern/boo b/hecl/extern/boo
index 452a17aea..581971ba0 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 452a17aea47412602b1ac5399e2c288e82e8cdca
+Subproject commit 581971ba099c009c83a45a30702e705251cdd220