diff --git a/ArduPlane/version.h b/ArduPlane/version.h
index 4cf646ab68..b0202ac001 100644
--- a/ArduPlane/version.h
+++ b/ArduPlane/version.h
@@ -6,12 +6,12 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "ArduPlane V3.9.0"
+#define THISFIRMWARE "ArduPlane V3.9.1beta1"
 
 // the following line is parsed by the autotest scripts
-#define FIRMWARE_VERSION 3,9,0,FIRMWARE_VERSION_TYPE_OFFICIAL
+#define FIRMWARE_VERSION 3,9,1,FIRMWARE_VERSION_TYPE_BETA
 
 #define FW_MAJOR 3
 #define FW_MINOR 9
-#define FW_PATCH 0
-#define FW_TYPE FIRMWARE_VERSION_TYPE_OFFICIAL
+#define FW_PATCH 1
+#define FW_TYPE FIRMWARE_VERSION_TYPE_BETA