diff --git a/ArduCopter/version.h b/ArduCopter/version.h
index 3c422c3f9e..71ba00b9c6 100644
--- a/ArduCopter/version.h
+++ b/ArduCopter/version.h
@@ -2,8 +2,8 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "APM:Copter V3.5.2"
-#define FIRMWARE_VERSION 3,5,2,FIRMWARE_VERSION_TYPE_OFFICIAL
+#define THISFIRMWARE "APM:Copter V3.5.3-rc1"
+#define FIRMWARE_VERSION 3,5,3,FIRMWARE_VERSION_TYPE_BETA
 
 #ifndef GIT_VERSION
 #define FIRMWARE_STRING THISFIRMWARE