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Over time more on-topic packages were released and some pages no longer meet development requirements.
Solution
- replace "aik099/phpunit-mink" package with "qa-tools/phpunit-extension"
- remove "mockery/mockery" package in favor of "phpspec/prophecy" package, that already comes bundled (means no need to include manually in "composer.json") with latest PHPUnit versions
- change "~" in dependency versions into "^"