This is the same type of issue as #17. It’s not related to Minishlink/web-push. One of your dependancies is stuck in the past with paragonie/random_compat v1.1.5. You should check which one and ask the owner to update the composer.json. To fix this temporarily, in your composer.json, on your dev machine put:
"paragonie/random_compat": "dev-master as 1.1.5",
"minishlink/web-push": "^1.1"
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solved Installation of package.json