diff --git a/ArduCopter/version.h b/ArduCopter/version.h
index b8c02702e824d..1bcc2f8a9e0a4 100644
--- a/ArduCopter/version.h
+++ b/ArduCopter/version.h
@@ -6,14 +6,14 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "ArduCopter V4.5.1"
+#define THISFIRMWARE "ArduCopter V4.5.2-beta1"
 
 // the following line is parsed by the autotest scripts
-#define FIRMWARE_VERSION 4,5,1,FIRMWARE_VERSION_TYPE_OFFICIAL
+#define FIRMWARE_VERSION 4,5,2,FIRMWARE_VERSION_TYPE_BETA
 
 #define FW_MAJOR 4
 #define FW_MINOR 5
-#define FW_PATCH 1
-#define FW_TYPE FIRMWARE_VERSION_TYPE_OFFICIAL
+#define FW_PATCH 2
+#define FW_TYPE FIRMWARE_VERSION_TYPE_BETA
 
 #include <AP_Common/AP_FWVersionDefine.h>