diff --git a/src/api/client.test.ts b/src/api/client.test.ts
index 358f6f0..2f23cde 100644
--- a/src/api/client.test.ts
+++ b/src/api/client.test.ts
@@ -55,7 +55,7 @@ describe('api client', () => {
     const [url, init] = fetchMock.mock.calls[0]
     expect(String(url)).toContain('/api/admin/v1/x')
     expect(init.headers.Authorization).toBe('Bearer token-1')
-    expect(init.headers['X-Language-Locale']).toBe('zh-CN')
+    expect(init.headers['X-Language-Locale']).toBe('zh-Hans')
   })
 
   it('sends FormData untouched so the browser can set the multipart boundary', async () => {
diff --git a/src/api/client.ts b/src/api/client.ts
index 2a1dc0f..4888abb 100644
--- a/src/api/client.ts
+++ b/src/api/client.ts
@@ -93,7 +93,7 @@ async function rawRequest(path: string, options: RequestOptions, retried = false
   const { accessToken } = useAuthStore.getState()
   const headers: Record<string, string> = {
     Accept: 'application/json',
-    'X-Language-Locale': 'zh-CN',
+    'X-Language-Locale': 'zh-Hans',
   }
   // A FormData body must be passed through untouched: the browser sets
   // `multipart/form-data` *with the boundary parameter*, which we cannot