diff --git a/VERSION b/VERSION
index 0d91a54..1d0ba9e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.0
+0.4.0
diff --git a/frontend/src/lib/releaseNotes.ts b/frontend/src/lib/releaseNotes.ts
index 53d9bd7..4f89cea 100644
--- a/frontend/src/lib/releaseNotes.ts
+++ b/frontend/src/lib/releaseNotes.ts
@@ -14,6 +14,18 @@ export interface ReleaseEntry {
 }
 
 export const RELEASE_NOTES: ReleaseEntry[] = [
+  {
+    version: "0.4.0",
+    date: "2026-06-16",
+    summary: "A clearer left-hand navigation, a glassier look, and account switching.",
+    features: [
+      "New left navigation sidebar: Feed, Channels, Playlists and Stats are now always visible (no longer tucked under your avatar), and the rail collapses to icons when you want more room.",
+      "Switch accounts without signing in again: the account menu lists everyone signed in on this browser — pick one to switch instantly, or “Add another account”. Signing out drops you to the next account if you have one.",
+      "Settings is now its own page that opens right where you are, instead of a panel sliding in from the far side.",
+      "The browser/back button now steps back through the app (Feed, Channels, …) instead of leaving the app.",
+      "A frosted-glass refresh across the navigation, header and dialogs.",
+    ],
+  },
   {
     version: "0.3.0",
     date: "2026-06-16",