Can not instalol for latest laravel

[auctionperfect]

My composer.json file has
"laravel/framework": "^6.2",
"laravel/nova": "*",

Problem 1
- Can only install one of: laravel/framework[v6.16.0, 5.8.x-dev].
- Can only install one of: laravel/framework[5.8.x-dev, v6.16.0].
- Can only install one of: laravel/framework[5.8.x-dev, v6.16.0].
- klepak/nova-depend-fill v1.0 requires laravel/framework 5.8.* -> satisfiable by laravel/framework[5.8.x-dev].
- Installation request for klepak/nova-depend-fill ^1.0 -> satisfiable by klepak/nova-depend-fill[v1.0].
- Installation request for laravel/framework (locked at v6.16.0, required as ^6.0) -> satisfiable by laravel/framework[v6.16.0].