diff --git a/CHANGELOG.md b/CHANGELOG.md
index e261978..c7442ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Unreleased
 
+
+# 0.4.0 (2026-07-19)
+
 ## Breaking changes
 - Config: `rootfsSize` moved from the config top level into the new `resources`
   block (i.e. `{ "resources": { "rootfsSize": "2G" } }`). Update configs that
diff --git a/package-lock.json b/package-lock.json
index 1021d21..b511f26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "tuor-sandbox",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "tuor-sandbox",
-      "version": "0.3.1",
+      "version": "0.4.0",
       "license": "Apache-2.0",
       "dependencies": {
         "@earendil-works/gondolin": "^0.12.0",
diff --git a/package.json b/package.json
index 09ff176..a98721c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tuor-sandbox",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "author": "codethief <git@codethief.eu>",
   "repository": {
     "url": "github:codethief/tuor"