Composer\Downloader\TransportException

When i run composer codes , it shows me this error. how can i fix this ?

Already up to date.
HEAD is now at 95f1198 Custom Seeder Commands Run 3
Loading composer repositories with package information
https://repo.packagist.org could not be fully loaded (curl error 28 while downloading https://repo.packagist.org/packages.json: Failed to connect to repo.packagist.org port 443: Connection timed out), package information was loaded from the local cache and may be out of date


  [Composer\Downloader\TransportException]
  curl error 28 while downloading https://repo.packagist.org/p2/fideloper/proxy.json: Failed to connect to repo.packagist.org port 443: Connection timed out