Update BRANCHES.md

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/BRANCHES.md b/BRANCHES.md
index c7a6082..a2ea074 100644
--- a/BRANCHES.md
+++ b/BRANCHES.md
@@ -101,6 +101,6 @@
 - [`development`](https://github.com/Mbed-TLS/mbedtls/)
 - [`mbedtls-2.28`](https://github.com/Mbed-TLS/mbedtls/tree/mbedtls-2.28)
  maintained until at least the end of 2024, see
-  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.2>.
+  <https://github.com/Mbed-TLS/mbedtls/releases/tag/v2.28.3>.
 
 Users are urged to always use the latest version of a maintained branch.