diff --git a/apps/web/src/components/NewVersionToastCoordinator.tsx b/apps/web/src/components/NewVersionToastCoordinator.tsx
new file mode 100644
index 0000000000..dd4800fa0e
--- /dev/null
+++ b/apps/web/src/components/NewVersionToastCoordinator.tsx
@@ -0,0 +1,65 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+import { useDesktopUpdateState } from "../lib/desktopUpdateReactQuery";
+import { toastManager } from "./ui/toast";
+import {
+  acknowledgeCurrentVersion,
+  getNewVersionReleaseNotesUrl,
+  readLastAcknowledgedVersion,
+  shouldShowNewVersionToast,
+} from "./desktopUpdate.logic";
+
+export function NewVersionToastCoordinator() {
+  const { data: updateState } = useDesktopUpdateState();
+  const toastIdRef = useRef<ReturnType<typeof toastManager.add> | null>(null);
+
+  useEffect(() => {
+    if (!updateState?.enabled) return;
+    const currentVersion = updateState.currentVersion;
+    if (!currentVersion) return;
+
+    if (readLastAcknowledgedVersion() === null) {
+      acknowledgeCurrentVersion(updateState);
+      return;
+    }
+
+    if (!shouldShowNewVersionToast(updateState)) return;
+
+    acknowledgeCurrentVersion(updateState);
+
+    if (toastIdRef.current) {
+      toastManager.close(toastIdRef.current);
+    }
+
+    toastIdRef.current = toastManager.add({
+      type: "success",
+      title: `Updated to v${currentVersion}`,
+      description: "View what's new in this release",
+      timeout: 0,
+      actionProps: {
+        children: "View release notes",
+        onClick: async () => {
+          const bridge = window.desktopBridge;
+          const url = getNewVersionReleaseNotesUrl(currentVersion);
+          if (bridge?.openExternal) {
+            await bridge.openExternal(url);
+          } else {
+            window.open(url, "_blank", "noopener,noreferrer");
+          }
+        },
+      },
+    });
+  }, [updateState]);
+
+  useEffect(() => {
+    return () => {
+      if (toastIdRef.current) {
+        toastManager.close(toastIdRef.current);
+        toastIdRef.current = null;
+      }
+    };
+  }, []);
+
+  return null;
+}
diff --git a/apps/web/src/components/desktopUpdate.logic.test.ts b/apps/web/src/components/desktopUpdate.logic.test.ts
index 454ecdfe0e..91534cd92f 100644
--- a/apps/web/src/components/desktopUpdate.logic.test.ts
+++ b/apps/web/src/components/desktopUpdate.logic.test.ts
@@ -1,17 +1,21 @@
-import { describe, expect, it } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import type { DesktopUpdateActionResult, DesktopUpdateState } from "@t3tools/contracts";
 
 import {
+  acknowledgeCurrentVersion,
   canCheckForUpdate,
   getArm64IntelBuildWarningDescription,
   getDesktopUpdateActionError,
   getDesktopUpdateButtonTooltip,
   getDesktopUpdateInstallConfirmationMessage,
+  getNewVersionReleaseNotesUrl,
   isDesktopUpdateButtonDisabled,
+  readLastAcknowledgedVersion,
   resolveDesktopUpdateButtonAction,
   shouldShowArm64IntelBuildWarning,
   shouldShowDesktopUpdateButton,
   shouldToastDesktopUpdateActionResult,
+  shouldShowNewVersionToast,
 } from "./desktopUpdate.logic";
 
 const baseState: DesktopUpdateState = {
@@ -290,3 +294,76 @@ describe("getDesktopUpdateButtonTooltip", () => {
     );
   });
 });
+
+describe("new version toast", () => {
+  beforeEach(() => {
+    const store: Record<string, string> = {};
+    vi.stubGlobal("localStorage", {
+      getItem: (key: string) => store[key] ?? null,
+      setItem: (key: string, value: string) => {
+        store[key] = value;
+      },
+      removeItem: (key: string) => {
+        delete store[key];
+      },
+      clear: () => {
+        for (const k of Object.keys(store)) delete store[k];
+      },
+    });
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("constructs the correct release notes URL", () => {
+    expect(getNewVersionReleaseNotesUrl("1.2.3")).toBe(
+      "https://github.com/pingdotgg/t3code/releases/tag/v1.2.3",
+    );
+  });
+
+  it("does not show toast when update state is null", () => {
+    expect(shouldShowNewVersionToast(null)).toBe(false);
+    expect(shouldShowNewVersionToast(undefined)).toBe(false);
+  });
+
+  it("does not show toast when updates are disabled", () => {
+    expect(shouldShowNewVersionToast({ ...baseState, enabled: false })).toBe(false);
+  });
+
+  it("does not show toast when no acknowledged version is stored and has no side effects", () => {
+    expect(readLastAcknowledgedVersion()).toBeNull();
+    expect(shouldShowNewVersionToast(baseState)).toBe(false);
+    expect(readLastAcknowledgedVersion()).toBeNull();
+  });
+
+  it("shows toast when version changes from acknowledged version", () => {
+    acknowledgeCurrentVersion(baseState);
+    expect(readLastAcknowledgedVersion()).toBe("1.0.0");
+
+    const updatedState: DesktopUpdateState = { ...baseState, currentVersion: "1.1.0" };
+    expect(shouldShowNewVersionToast(updatedState)).toBe(true);
+  });
+
+  it("does not show toast when version matches acknowledged version", () => {
+    acknowledgeCurrentVersion(baseState);
+    expect(shouldShowNewVersionToast(baseState)).toBe(false);
+  });
+
+  it("acknowledgeCurrentVersion persists the current version", () => {
+    const state: DesktopUpdateState = { ...baseState, currentVersion: "2.0.0" };
+    acknowledgeCurrentVersion(state);
+    expect(readLastAcknowledgedVersion()).toBe("2.0.0");
+  });
+
+  it("acknowledgeCurrentVersion does nothing for disabled updates", () => {
+    acknowledgeCurrentVersion({ ...baseState, enabled: false });
+    expect(readLastAcknowledgedVersion()).toBeNull();
+  });
+
+  it("does not show toast when acknowledged version matches after first launch", () => {
+    acknowledgeCurrentVersion(baseState);
+    expect(shouldShowNewVersionToast(baseState)).toBe(false);
+    expect(shouldShowNewVersionToast(baseState)).toBe(false);
+  });
+});
diff --git a/apps/web/src/components/desktopUpdate.logic.ts b/apps/web/src/components/desktopUpdate.logic.ts
index 38983c810b..b8d32f294b 100644
--- a/apps/web/src/components/desktopUpdate.logic.ts
+++ b/apps/web/src/components/desktopUpdate.logic.ts
@@ -1,5 +1,51 @@
 import type { DesktopUpdateActionResult, DesktopUpdateState } from "@t3tools/contracts";
 
+const LAST_ACKNOWLEDGED_VERSION_KEY = "t3code:lastAcknowledgedDesktopVersion";
+
+export const GITHUB_RELEASES_URL = "https://github.com/pingdotgg/t3code/releases/tag";
+
+export function getNewVersionReleaseNotesUrl(version: string): string {
+  return `${GITHUB_RELEASES_URL}/v${version}`;
+}
+
+export function shouldShowNewVersionToast(
+  updateState: DesktopUpdateState | null | undefined,
+): boolean {
+  if (!updateState?.enabled) return false;
+  const currentVersion = updateState.currentVersion;
+  if (!currentVersion) return false;
+
+  const lastAcknowledged = readLastAcknowledgedVersion();
+  if (lastAcknowledged === null) return false;
+  return currentVersion !== lastAcknowledged;
+}
+
+export function acknowledgeCurrentVersion(
+  updateState: DesktopUpdateState | null | undefined,
+): void {
+  if (!updateState?.enabled) return;
+  const currentVersion = updateState.currentVersion;
+  if (currentVersion) {
+    persistLastAcknowledgedVersion(currentVersion);
+  }
+}
+
+export function readLastAcknowledgedVersion(): string | null {
+  try {
+    return localStorage.getItem(LAST_ACKNOWLEDGED_VERSION_KEY);
+  } catch {
+    return null;
+  }
+}
+
+function persistLastAcknowledgedVersion(version: string): void {
+  try {
+    localStorage.setItem(LAST_ACKNOWLEDGED_VERSION_KEY, version);
+  } catch {
+    // localStorage may be unavailable (incognito, SSR, etc.)
+  }
+}
+
 export type DesktopUpdateButtonAction = "download" | "install" | "none";
 
 export function resolveDesktopUpdateButtonAction(
diff --git a/apps/web/src/routes/__root.tsx b/apps/web/src/routes/__root.tsx
index 87e8667901..673defa963 100644
--- a/apps/web/src/routes/__root.tsx
+++ b/apps/web/src/routes/__root.tsx
@@ -13,6 +13,7 @@ import { QueryClient, useQueryClient } from "@tanstack/react-query";
 import { APP_DISPLAY_NAME } from "../branding";
 import { AppSidebarLayout } from "../components/AppSidebarLayout";
 import { CommandPalette } from "../components/CommandPalette";
+import { NewVersionToastCoordinator } from "../components/NewVersionToastCoordinator";
 import {
   SlowRpcAckToastCoordinator,
   WebSocketConnectionCoordinator,
@@ -102,6 +103,7 @@ function RootRouteView() {
         <EnvironmentConnectionManagerBootstrap />
         <EventRouter />
         <WebSocketConnectionCoordinator />
+        <NewVersionToastCoordinator />
         <SlowRpcAckToastCoordinator />
         <WebSocketConnectionSurface>
           <CommandPalette>