diff --git a/.changeset/fix-native-update-false-success.md b/.changeset/fix-native-update-false-success.md
new file mode 100644
index 000000000..b373dd789
--- /dev/null
+++ b/.changeset/fix-native-update-false-success.md
@@ -0,0 +1,5 @@
+---
+"@moonshot-ai/kimi-code": patch
+---
+
+Fix the native self-updater reporting a successful update when the install command actually failed.
diff --git a/apps/kimi-code/src/cli/update/preflight.ts b/apps/kimi-code/src/cli/update/preflight.ts
index 385f1807e..692784d4e 100644
--- a/apps/kimi-code/src/cli/update/preflight.ts
+++ b/apps/kimi-code/src/cli/update/preflight.ts
@@ -77,7 +77,7 @@ interface SpawnCommand {
   readonly args: readonly string[];
 }
 
-function spawnForSource(
+export function spawnForSource(
   source: InstallSource,
   version: string,
   platform: NodeJS.Platform,
@@ -92,7 +92,12 @@ function spawnForSource(
     case 'bun-global':
       return { cmd: bunCommand(platform), args: ['add', '-g', `${NPM_PACKAGE_NAME}@${version}`] };
     case 'native':
-      return { cmd: 'bash', args: ['-c', NATIVE_INSTALL_COMMAND_UNIX] };
+      // `curl … | bash` reports only the trailing bash's exit status, so a
+      // failed download (curl can't connect → empty stdin → bash exits 0)
+      // would look like a successful update. `pipefail` makes the pipeline
+      // surface curl's non-zero status so installUpdate() rejects and we warn
+      // instead of printing "Updated …".
+      return { cmd: 'bash', args: ['-c', `set -o pipefail; ${NATIVE_INSTALL_COMMAND_UNIX}`] };
     case 'unsupported':
       throw new Error('unsupported install source cannot be auto-installed');
   }
diff --git a/apps/kimi-code/test/cli/update/preflight.test.ts b/apps/kimi-code/test/cli/update/preflight.test.ts
index dc115c9e4..e497cba53 100644
--- a/apps/kimi-code/test/cli/update/preflight.test.ts
+++ b/apps/kimi-code/test/cli/update/preflight.test.ts
@@ -1,10 +1,11 @@
 import type * as ChildProcess from 'node:child_process';
+import { spawnSync } from 'node:child_process';
 import { EventEmitter } from 'node:events';
 
 import { afterEach, describe, expect, it, vi } from 'vitest';
 
 import { readUpdateCache } from '#/cli/update/cache';
-import { runUpdatePreflight } from '#/cli/update/preflight';
+import { runUpdatePreflight, spawnForSource } from '#/cli/update/preflight';
 import { promptForInstallConfirmation } from '#/cli/update/prompt';
 import type * as PromptModule from '#/cli/update/prompt';
 import { refreshUpdateCache } from '#/cli/update/refresh';
@@ -182,7 +183,7 @@ describe('runUpdatePreflight', () => {
     );
   });
 
-  it('native on darwin: spawns bash -c curl|bash', async () => {
+  it('native on darwin: spawns bash -c with pipefail-guarded curl|bash', async () => {
     mocks.readUpdateCache.mockResolvedValue(cacheWith('0.5.0'));
     mocks.refreshUpdateCache.mockResolvedValue(cacheWith('0.5.0'));
     mocks.detectInstallSource.mockResolvedValue('native');
@@ -193,11 +194,16 @@ describe('runUpdatePreflight', () => {
     try {
       const { options } = captureOutput();
       await runUpdatePreflight('0.4.0', options);
-      expect(mocks.spawn).toHaveBeenCalledWith(
-        'bash',
-        ['-c', expect.stringContaining('curl -fsSL https://code.kimi.com/kimi-code/install.sh')],
-        { stdio: 'inherit' },
-      );
+      const call = mocks.spawn.mock.calls[0];
+      expect(call?.[0]).toBe('bash');
+      expect(call?.[2]).toEqual({ stdio: 'inherit' });
+      const [flag, script] = call?.[1] as string[];
+      expect(flag).toBe('-c');
+      // pipefail must come before the pipeline so a failed `curl` is not masked
+      // by the trailing `bash` exiting 0 (see "surfaces a failed curl" below).
+      expect(script).toContain('set -o pipefail');
+      expect(script).toContain('curl -fsSL https://code.kimi.com/kimi-code/install.sh');
+      expect(script).toContain('| bash');
     } finally {
       Object.defineProperty(process, 'platform', { value: originalPlatform });
     }
@@ -240,15 +246,17 @@ describe('runUpdatePreflight', () => {
     expect(mocks.spawn).not.toHaveBeenCalled();
   });
 
-  it('warns and continues when spawn exits non-zero', async () => {
+  it('warns and continues when spawn exits non-zero, without claiming success', async () => {
     mocks.readUpdateCache.mockResolvedValue(cacheWith('0.5.0'));
     mocks.refreshUpdateCache.mockResolvedValue(cacheWith('0.5.0'));
     mocks.detectInstallSource.mockResolvedValue('npm-global');
     mocks.promptForInstallConfirmation.mockResolvedValue(true);
     mockSpawnExit(1);
-    const { stderr, options } = captureOutput();
+    const { stdout, stderr, options } = captureOutput();
     await expect(runUpdatePreflight('0.4.0', options)).resolves.toBe('continue');
     expect(stderr.join('')).toContain('warning: failed to install');
+    // A failed install must never print the "Updated …" success line.
+    expect(stdout.join('')).not.toContain('Updated @moonshot-ai/kimi-code');
   });
 
   it('tracks update_prompted telemetry', async () => {
@@ -267,3 +275,23 @@ describe('runUpdatePreflight', () => {
     }));
   });
 });
+
+describe('spawnForSource native', () => {
+  // No spawn mock here — we run real bash to prove the failure contract
+  // end-to-end. `curl … | bash` reports only the trailing bash's exit status,
+  // so a curl that never connects (exit 7, empty stdin → bash exits 0) is
+  // masked and the update is wrongly reported as successful. `set -o pipefail`
+  // makes the pipeline surface curl's failure. Shadowing `curl` with a shell
+  // function keeps this offline and deterministic; skipped on Windows (no bash,
+  // and native auto-install is unsupported there anyway).
+  it.skipIf(process.platform === 'win32')(
+    'surfaces a failed curl download as a non-zero exit',
+    () => {
+      const { cmd, args } = spawnForSource('native', '0.5.0', 'darwin');
+      const script = `curl() { return 7; }\n${args[1] ?? ''}`;
+      const result = spawnSync(cmd, [args[0] ?? '-c', script], { encoding: 'utf8' });
+      expect(result.error).toBeUndefined();
+      expect(result.status).toBeGreaterThan(0);
+    },
+  );
+});