Installation issue with guzzlehttp/guzzle version

[hfmiguel-baufest]

Hi, I've tried to install package with:
composer require erusso7/redsys-rest
But receive an error:
`Your requirements could not be resolved to an installable set of packages.

Problem 1
- Can only install one of: guzzlehttp/guzzle[7.4.3, 6.5.x-dev].
- Can only install one of: guzzlehttp/guzzle[6.5.x-dev, 7.4.3].
- Can only install one of: guzzlehttp/guzzle[6.5.x-dev, 7.4.3].
- erusso7/redsys-rest 0.1.2 requires guzzlehttp/guzzle ^6.0 -> satisfiable by guzzlehttp/guzzle[6.5.x-dev].
- Installation request for erusso7/redsys-rest ^0.1.2 -> satisfiable by erusso7/redsys-rest[0.1.2].
- Installation request for guzzlehttp/guzzle (locked at 7.4.3, required as ^7.0.1) -> satisfiable by guzzlehttp/guzzle[7.4.3].

Installation failed, reverting ./composer.json to its original content.`

I dont have guzzlehttp as direct package so I cant just decrease its version