diff --git a/m4 b/m4
index 57027c6c..b3dea05e 160000
--- a/m4
+++ b/m4
@@ -1 +1 @@
-Subproject commit 57027c6cc3f8b26d59e9560b4ac72a1a06d643b9
+Subproject commit b3dea05e6a626729b67f5803159b0f865f518949