diff --git a/gram_core b/gram_core
index af709ec5..ba02f9cc 160000
--- a/gram_core
+++ b/gram_core
@@ -1 +1 @@
-Subproject commit af709ec5da23040949cbcbdb8e6833039c904894
+Subproject commit ba02f9cc75b67189ff9c55a17da48f44a0a54531