diff --git a/ArduSub/ReleaseNotes.txt b/ArduSub/ReleaseNotes.txt
index d285c9691a..6507c9db49 100644
--- a/ArduSub/ReleaseNotes.txt
+++ b/ArduSub/ReleaseNotes.txt
@@ -1,5 +1,8 @@
 APM:Sub Release Notes:
 
+Sub-4.5.0 beta3 2-September-2024
+- Add BMP390 support to Navigator
+
 Sub-4.5.0 beta2 18-July-2024
 - Created ORIGIN_LAT/LON/ALT parameters for setting a default efk origin when no positioning sensor is available
 - Allow estimating the World Magnetic Model using location or ekf origin instead of GPS
diff --git a/ArduSub/version.h b/ArduSub/version.h
index b86f4f8905..e11d13c56d 100644
--- a/ArduSub/version.h
+++ b/ArduSub/version.h
@@ -6,14 +6,14 @@
 
 #include "ap_version.h"
 
-#define THISFIRMWARE "ArduSub V4.5.0-beta2"
+#define THISFIRMWARE "ArduSub V4.5.0-beta3"
 
 // the following line is parsed by the autotest scripts
-#define FIRMWARE_VERSION 4,5,0,FIRMWARE_VERSION_TYPE_BETA+1
+#define FIRMWARE_VERSION 4,5,0,FIRMWARE_VERSION_TYPE_BETA+2
 
 #define FW_MAJOR 4
 #define FW_MINOR 5
 #define FW_PATCH 0
-#define FW_TYPE FIRMWARE_VERSION_TYPE_BETA+1
+#define FW_TYPE FIRMWARE_VERSION_TYPE_BETA+2
 
 #include <AP_Common/AP_FWVersionDefine.h>
\ No newline at end of file