diff --git a/vendor/grammars-v4 b/vendor/grammars-v4
index 284602b..994628b 160000
--- a/vendor/grammars-v4
+++ b/vendor/grammars-v4
@@ -1 +1 @@
-Subproject commit 284602b3f23ca54dc30778204ab7ae9e969145e9
+Subproject commit 994628b6d261f5313b72e76039818549352684ce