diff --git a/ext/lwip-contrib b/ext/lwip-contrib
index 2917f46..4d18380 160000
--- a/ext/lwip-contrib
+++ b/ext/lwip-contrib
@@ -1 +1 @@
-Subproject commit 2917f46ded09ad83d2567171751df16c03366cbb
+Subproject commit 4d1838043ec8d31ff308fa10326ea8e3a61063cd