diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 78eb0cd53..bf816e2b0 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -30,6 +30,19 @@ jobs:
           VERSION_NUMBER: ${{ github.event.inputs.version_number }}
           COMMIT_ID: ${{ github.event.inputs.commit_id }}
         run: git checkout -b "$VERSION_NUMBER" "$COMMIT_ID"
+      - name: Update version number in source files
+        env:
+          VERSION_NUMBER: ${{ github.event.inputs.version_number }}
+          REPO_NAME: ${{ github.event.repository.name }}
+          source_folder_list: "source test"
+        run: |
+            echo "${{ env.source_folder_list }}" | \
+            xargs -n 1 sh -c \
+            'find $1 -type f \( -name "*.c" -o -name "*.h" \) \
+            -exec sed -i -b -E "0,/^ \* FreeRTOS\+TCP/s/^ \* FreeRTOS\+TCP.*/ \* FreeRTOS\+TCP $VERSION_NUMBER/g" {} +'
+            git add .
+            git commit -m '[AUTO][RELEASE]: Update version number in source files'
+            git push -u origin "$VERSION_NUMBER"
       - name: Generate SBOM
         uses: FreeRTOS/CI-CD-Github-Actions/sbom-generator@main
         with:
diff --git a/History.txt b/History.txt
index 3275574f9..a1eeb82fe 100644
--- a/History.txt
+++ b/History.txt
@@ -1,5 +1,54 @@
 Documentation and download available at https://www.FreeRTOS.org/
 
+Changes between FreeRTOS-plus-TCP V4.3.0 and V4.2.2 released December 10, 2024
+	+ Fix TCP RX sequence number when handling refusal of FIN packets.
+	+ Fix unicast packets being sent over inactive endpoints. We thank
+	  @AlfaSegato for their contribution.
+	+ Fix the initialization of the DNS callback list every time there is a
+	  Network-UP event. We thank @evpopov for their contribution.
+	+ Full ARP/ND build level separation.
+	  We thank @HTRamsey for their contribution.
+	+ Update the `eARPGetCacheEntry` to handle loopback addresses correctly
+	  and assign the loopback endpoint's MAC address as the lookup MAC address.
+	  We thank @htibosch for their contribution.
+	+ Replace the costly `vTaskSuspendAll`/`xTaskResumeAll` locking
+	  mechanism with the more efficient `taskENTER_CRITICAL`/`taskEXIT_CRITICAL`
+	  pair in frequenly used `uxStreamBufferAdd()`.
+	  We thank @lzungri for their contribution.
+	+ Improve frame filtering by expanding the checks in
+	  eConsiderFrameForProcessing to drop invalid frames earlier.
+	  We thank @HTRamsey for their contribution.
+	+ Fix reception of multicast custom Ethernet frames, where custom multicast
+	  frames were filtered out. We thank @evpopov for their contribution.
+	+ Update the Zynq Ultrascale port to support the V4.x.x version of
+	  FreeRTOS+TCP. We thank @StefanBalt and @pete-pjb for their contribution.
+	+ New unified STM32 network interface for STM32 F4/F7/H5/H7.
+	  We thank @HTRamsey for their contribution.
+	+ Fix ATSAME5x network interface related to incorrect detection of ICMP.
+	  We thank @cruxic for their contribution.
+	+ Update Renesas portable layer for backward compatibility.
+	  We thank @xuan97z1 for their contribution.
+	+ Replace any missing functions by assert-false in all CBMC proofs to
+	  improve tests. We thank @tautschnig for their contribution.
+	+ Add ipconfigEMAC_TASK_HOOK macro to allow for a configurable
+	  watchdog timer for STMH7xx MCUs. We thank @kzorer for their contribution.
+	+ Improve CMake to allow usage of `FetchContent` in external projects.
+	  We thank @nicovanduijn for their contribution.
+	+ Add warning logs if the TCP stream buffer or window properties
+	  are changed. We thank @evpopov for their contribution.
+	+ Remove unused `ipconfigHAS_ROUTING_STATISTICS` macro.
+	  We thank @HTRamsey for their contribution.
+	+ Fix MISRA 2012 violations with the latest version of
+	  MISRA evalution tools.
+	+ Adjust CBMC proof tooling to support CBMC v6.
+	  We thank @tautschnig for their contribution.
+
+Changes between FreeRTOS-plus-TCP V4.2.2 and V4.2.1 released July 12, 2024:
+	+ Update version information in public header file which were not present earlier.
+
+Changes between FreeRTOS-plus-TCP V4.2.1 and V4.2.0 released June 27, 2024:
+	+ Update version information in source files which were not present earlier.
+
 Changes between FreeRTOS-plus-TCP V4.2.0 and V4.1.0 released June 24, 2024
     + It was possible for a carefully crafted DNS response with domain name
       length value greater than the actual domain name length, to cause a buffer
diff --git a/docs/doxygen/config.doxyfile b/docs/doxygen/config.doxyfile
index 9f406bd07..99d7c4c05 100644
--- a/docs/doxygen/config.doxyfile
+++ b/docs/doxygen/config.doxyfile
@@ -48,7 +48,7 @@ PROJECT_NAME           = FreeRTOS-Plus-TCP
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = V4.2.0
+PROJECT_NUMBER         = V4.3.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/manifest.yml b/manifest.yml
index 5f19b66e9..e5b52772e 100644
--- a/manifest.yml
+++ b/manifest.yml
@@ -1,5 +1,5 @@
 name: "FreeRTOS-Plus-TCP"
-version: "V4.2.0"
+version: "V4.3.0"
 description:
   "Thread safe FreeRTOS TCP/IP stack working on top of the FreeRTOS-Kernel to
   implement the TCP/IP protocol. Suitable for microcontrollers."
diff --git a/source/FreeRTOS_BitConfig.c b/source/FreeRTOS_BitConfig.c
index 515b8770d..5fd3d2dee 100644
--- a/source/FreeRTOS_BitConfig.c
+++ b/source/FreeRTOS_BitConfig.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/FreeRTOS_DHCPv6.c b/source/FreeRTOS_DHCPv6.c
index 6bf6fc50a..978fa395d 100644
--- a/source/FreeRTOS_DHCPv6.c
+++ b/source/FreeRTOS_DHCPv6.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2022 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/FreeRTOS_ND.c b/source/FreeRTOS_ND.c
index 476c2a4c6..3dddfc470 100644
--- a/source/FreeRTOS_ND.c
+++ b/source/FreeRTOS_ND.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/FreeRTOS_RA.c b/source/FreeRTOS_RA.c
index a9ef1fc8b..2f6875ff8 100644
--- a/source/FreeRTOS_RA.c
+++ b/source/FreeRTOS_RA.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/FreeRTOS_Routing.c b/source/FreeRTOS_Routing.c
index 7be575193..097f91708 100644
--- a/source/FreeRTOS_Routing.c
+++ b/source/FreeRTOS_Routing.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/include/FreeRTOS_BitConfig.h b/source/include/FreeRTOS_BitConfig.h
index 952bfb714..3cc313d99 100644
--- a/source/include/FreeRTOS_BitConfig.h
+++ b/source/include/FreeRTOS_BitConfig.h
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/include/FreeRTOS_DHCPv6.h b/source/include/FreeRTOS_DHCPv6.h
index 0e2792c86..11bf3f033 100644
--- a/source/include/FreeRTOS_DHCPv6.h
+++ b/source/include/FreeRTOS_DHCPv6.h
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/include/FreeRTOS_IP.h b/source/include/FreeRTOS_IP.h
index bb99f5c12..a177dcc05 100644
--- a/source/include/FreeRTOS_IP.h
+++ b/source/include/FreeRTOS_IP.h
@@ -44,9 +44,9 @@
 
 /* Constants defining the current version of the FreeRTOS+TCP
  * network stack. */
-#define ipFR_TCP_VERSION_NUMBER    "V4.2.999"
+#define ipFR_TCP_VERSION_NUMBER    "V4.3.999"
 #define ipFR_TCP_VERSION_MAJOR     4
-#define ipFR_TCP_VERSION_MINOR     2
+#define ipFR_TCP_VERSION_MINOR     3
 /* Development builds are always version 999. */
 #define ipFR_TCP_VERSION_BUILD     999
 
diff --git a/source/include/FreeRTOS_IPv6.h b/source/include/FreeRTOS_IPv6.h
index ea2d9dbca..84b841595 100644
--- a/source/include/FreeRTOS_IPv6.h
+++ b/source/include/FreeRTOS_IPv6.h
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/include/FreeRTOS_ND.h b/source/include/FreeRTOS_ND.h
index e6119f05c..f7c791ace 100644
--- a/source/include/FreeRTOS_ND.h
+++ b/source/include/FreeRTOS_ND.h
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/include/FreeRTOS_Routing.h b/source/include/FreeRTOS_Routing.h
index dc45a0d67..0fa9fab88 100644
--- a/source/include/FreeRTOS_Routing.h
+++ b/source/include/FreeRTOS_Routing.h
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/portable/NetworkInterface/DriverSAM/NetworkInterface.c b/source/portable/NetworkInterface/DriverSAM/NetworkInterface.c
index 8a837dd35..b79d1008f 100644
--- a/source/portable/NetworkInterface/DriverSAM/NetworkInterface.c
+++ b/source/portable/NetworkInterface/DriverSAM/NetworkInterface.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of
diff --git a/source/portable/NetworkInterface/loopback/loopbackNetworkInterface.c b/source/portable/NetworkInterface/loopback/loopbackNetworkInterface.c
index 9152d4744..ffe058be5 100644
--- a/source/portable/NetworkInterface/loopback/loopbackNetworkInterface.c
+++ b/source/portable/NetworkInterface/loopback/loopbackNetworkInterface.c
@@ -1,5 +1,5 @@
 /*
- * FreeRTOS+TCP V2.3.1
+ * FreeRTOS+TCP <DEVELOPMENT BRANCH>
  * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy of