diff --git a/src/lib/commands.ts b/src/lib/commands.ts
index 90e8c50..3fa4369 100644
--- a/src/lib/commands.ts
+++ b/src/lib/commands.ts
@@ -1655,7 +1655,14 @@ export const giteaDeleteInstance = (id: string) =>
 export const giteaUpdateInstance = (
   id: string,
   fields: { name?: string; url?: string; access_token?: string; is_default?: boolean }
-) => invoke<GiteaInstance>("gitea_update_instance", { id, ...fields });
+  // Tauri 命令参数按 camelCase 匹配 Rust snake_case，直接展开 snake_case 字段会被静默丢弃
+) => invoke<GiteaInstance>("gitea_update_instance", {
+  id,
+  name: fields.name,
+  url: fields.url,
+  accessToken: fields.access_token,
+  isDefault: fields.is_default,
+});
 
 export const giteaTestConnection = (instanceId: string) =>
   invoke<GiteaUser>("gitea_test_connection", { instanceId });