Composer.json requires old version of guzzle

[SolneilE]

When installing via composer on a system with a current (7.4.2) version of guzzlehttp/guzzle, I cannot install owa-php-sdk (1.0.6) due to the lock on a specific (old) version of guzzlehttp/guzzle (6.5.3). Guzzlehttp ^7 is required by some of my other packages.

Please update the required version of guzzlehttp/guzzle.

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Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - open-web-analytics/owa-php-sdk[1.0.0, ..., 1.0.1] require guzzlehttp/guzzle ~6.0 -> found guzzlehttp/guzzle[6.0.0, ..., 6.5.5] but it conflicts with your root composer.json require (^7.0).
    - open-web-analytics/owa-php-sdk[1.0.2, ..., 1.0.6] require guzzlehttp/guzzle 6.5.3 -> found guzzlehttp/guzzle[6.5.3] but it conflicts with your root composer.json require (^7.0).
    - Root composer.json requires open-web-analytics/owa-php-sdk ^1.0 -> satisfiable by open-web-analytics/owa-php-sdk[1.0.0, ..., 1.0.6].

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.