diff --git a/m4 b/m4
index 81475c9..4462789 160000
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit 81475c941e1474e9462fbf7b8fcfa16a52f55fc8
+Subproject commit 4462789c5a4bb4633ecd993f2240046cb8c46de5