diff --git a/vendor/grammars-v4 b/vendor/grammars-v4
index 284602b..42b1ea5 160000
--- a/vendor/grammars-v4
+++ b/vendor/grammars-v4
@@ -1 +1 @@
-Subproject commit 284602b3f23ca54dc30778204ab7ae9e969145e9
+Subproject commit 42b1ea521705c126d84331186b221c9819db1058