diff --git a/stm-firmware/shellmatta b/stm-firmware/shellmatta
index 48fcf05..2921f97 160000
--- a/stm-firmware/shellmatta
+++ b/stm-firmware/shellmatta
@@ -1 +1 @@
-Subproject commit 48fcf05b7d54acc03368c90ad8cf437f302f3346
+Subproject commit 2921f9791b69e2026331e14a2f77f5e88c995321