diff --git a/ArduPlane/ReleaseNotes.txt b/ArduPlane/ReleaseNotes.txt
index 8a4679d860..391183c5bf 100644
--- a/ArduPlane/ReleaseNotes.txt
+++ b/ArduPlane/ReleaseNotes.txt
@@ -1,3 +1,9 @@
+Release 5.2.1 25th July 2024
+------------------------------
+ - Volanti specific changes
+  - FFT has been re enabled and Pitch rate D and I gain have been changed to support it. 
+  - Q_WP_SPEED_DN set to be 200 this will increase descent time before it hits land final alt.
+
 Release 5.2.0 21th June 2024
 ------------------------------
  - Added a prearm check for a crash dump file. If one is found, arming will be blocked by the prearm. 
diff --git a/libraries/AP_Common/CxVersion.h b/libraries/AP_Common/CxVersion.h
index 25790e6fd8..737f55f531 100644
--- a/libraries/AP_Common/CxVersion.h
+++ b/libraries/AP_Common/CxVersion.h
@@ -1,5 +1,5 @@
 #ifdef CARBOPILOT
 #ifndef AP_CUSTOM_FIRMWARE_STRING
-#define AP_CUSTOM_FIRMWARE_STRING "CxPilot-5.2.0"
+#define AP_CUSTOM_FIRMWARE_STRING "CxPilot-5.2.1"
 #endif
 #endif