diff --git a/ArduCopter/version.h b/ArduCopter/version.h
index 8058958fa0..3bab70bfe4 100644
--- a/ArduCopter/version.h
+++ b/ArduCopter/version.h
@@ -6,7 +6,7 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "ZRUAV v4.0.15-RC5"  //"ArduCopter V4.0.0"
+#define THISFIRMWARE "ZRUAV v4.0.15-RC6"  //"ArduCopter V4.0.0"
 
 // the following line is parsed by the autotest scripts
 #define FIRMWARE_VERSION 4,0,15,FIRMWARE_VERSION_TYPE_OFFICIAL