diff --git a/gram_core b/gram_core
index c935844..6d1e8bc 160000
--- a/gram_core
+++ b/gram_core
@@ -1 +1 @@
-Subproject commit c935844958321754f04260bd330400b54d01851b
+Subproject commit 6d1e8bcc497ed255e581b5e47de88e01cdef98f7