diff --git a/hecl/extern/boo b/hecl/extern/boo
index 59f42ae85..9b1339044 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 59f42ae85f3b066e4361b96c71a770a1cdfed93e
+Subproject commit 9b133904473094839feacf610a69875d8b6155e5