diff --git a/CHANGELOG.md b/CHANGELOG.md
index 67d045b39..7dc70c220 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # NHS.UK frontend Changelog
 
-## Unreleased
+## 9.0.0 - 18 September 2024
 
 :boom: **Breaking changes**
 
diff --git a/package-lock.json b/package-lock.json
index 81077083c..fface2149 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "nhsuk-frontend",
-  "version": "8.3.0",
+  "version": "9.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "nhsuk-frontend",
-      "version": "8.3.0",
+      "version": "9.0.0",
       "license": "MIT",
       "devDependencies": {
         "@babel/core": "^7.24.7",
diff --git a/package.json b/package.json
index 9df337b6e..c99b881c4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nhsuk-frontend",
-  "version": "8.3.0",
+  "version": "9.0.0",
   "description": "NHS.UK frontend contains the code you need to start building user interfaces for NHS websites and services.",
   "engines": {
     "node": ">=20.0.0"