diff --git a/ArduCopter/version.h b/ArduCopter/version.h
index 26b4faa573..3b5b18028e 100644
--- a/ArduCopter/version.h
+++ b/ArduCopter/version.h
@@ -6,14 +6,14 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "ArduCopter V4.3.0"
+#define THISFIRMWARE "ArduCopter V4.3.1-rc1"
 
 // the following line is parsed by the autotest scripts
-#define FIRMWARE_VERSION 4,3,0,FIRMWARE_VERSION_TYPE_OFFICIAL
+#define FIRMWARE_VERSION 4,3,0,FIRMWARE_VERSION_TYPE_RC
 
 #define FW_MAJOR 4
 #define FW_MINOR 3
-#define FW_PATCH 0
-#define FW_TYPE FIRMWARE_VERSION_TYPE_OFFICIAL
+#define FW_PATCH 1
+#define FW_TYPE FIRMWARE_VERSION_TYPE_RC
 
 #include <AP_Common/AP_FWVersionDefine.h>