diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index cb1f3ff6559439b28c780f554beddc9925973c66..d58dc60b372135009921a7e7d1fcd4e84643546e 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -1,6 +1,6 @@
 /// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
 
-#define THISFIRMWARE "ArduCopter V3.1.4"
+#define THISFIRMWARE "ArduCopter V3.1.5-rc1"
 /*
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by