diff --git a/ArduCopter/version.h b/ArduCopter/version.h
index c4c643a402..34092026aa 100644
--- a/ArduCopter/version.h
+++ b/ArduCopter/version.h
@@ -6,14 +6,14 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "ArduCopter V4.1.0-dev"
+#define THISFIRMWARE "ArduCopter V4.2.0-dev"
 
 // the following line is parsed by the autotest scripts
-#define FIRMWARE_VERSION 4,1,0,FIRMWARE_VERSION_TYPE_DEV
+#define FIRMWARE_VERSION 4,2,0,FIRMWARE_VERSION_TYPE_DEV
 
 #define FW_MAJOR 4
-#define FW_MINOR 1
+#define FW_MINOR 2
 #define FW_PATCH 0
 #define FW_TYPE FIRMWARE_VERSION_TYPE_DEV
 
-#include <AP_Common/AP_FWVersionDefine.h>
\ No newline at end of file
+#include <AP_Common/AP_FWVersionDefine.h>