You need to wait till there is a 5.7 version of laravelcollective/html because the current latest is locked to 5.6
Or you can fork it, create a 5.7 version and use the composer aliases to use that fork. See https://getcomposer.org/doc/articles/aliases.md#require-inline-alias (and create a pull request to laravelcollective/html to let it update)
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