diff --git a/ArduCopter/version.h b/ArduCopter/version.h
index 8a4d89ec8d..d91402a76e 100644
--- a/ArduCopter/version.h
+++ b/ArduCopter/version.h
@@ -2,8 +2,8 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "APM:Copter V3.5.4"
-#define FIRMWARE_VERSION 3,5,4,FIRMWARE_VERSION_TYPE_OFFICIAL
+#define THISFIRMWARE "APM:Copter V3.5.5-rc1"
+#define FIRMWARE_VERSION 3,5,5,FIRMWARE_VERSION_TYPE_RC
 
 #ifndef GIT_VERSION
 #define FIRMWARE_STRING THISFIRMWARE