diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6429b9cac4..624398f123 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Unreleased
 
+# 9.9.0 (Feature release)
+
+## New features
+
+- [Pull request #908: Update to GOV.UK Frontend v3.8.0](https://github.com/alphagov/govuk-prototype-kit/pull/919)
+
 ## Fixes
 
 - [Pull request #913: Fix security issue when running on Glitch](https://github.com/alphagov/govuk-prototype-kit/pull/913)
diff --git a/VERSION.txt b/VERSION.txt
index 834eb3fa85..5ffe92dddc 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-9.8.0
+9.9.0
diff --git a/package.json b/package.json
index f43db5a27e..9cca841921 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "govuk-prototype-kit",
   "description": "Rapidly create HTML prototypes of GOV.UK services",
-  "version": "9.8.0",
+  "version": "9.9.0",
   "private": true,
   "engines": {
     "node": "^12.0.0"