diff --git a/extmod/ulab b/extmod/ulab
index aa7e741530..c4b06e419f 160000
--- a/extmod/ulab
+++ b/extmod/ulab
@@ -1 +1 @@
-Subproject commit aa7e741530df471d206a4a321823a37a913a0eb8
+Subproject commit c4b06e419f3d515478b05bb8ce03ebdb29cddec4