diff --git a/gram_core b/gram_core
index d10f0d4..181d284 160000
--- a/gram_core
+++ b/gram_core
@@ -1 +1 @@
-Subproject commit d10f0d4815d70804ea38686346671d230b7ab84c
+Subproject commit 181d284528da97484e973b893472f27fd93fcf89