Exact same problem here when trying to update from L5.3. Anyone found a solution yet?
I've tried deleting the vendor folder but that doesn't work either.
In the end I removed all the components in the "require" part of my composer.json file except for the main ones and then I added in the latest versions of all the packages I needed. This seemed to work.
Just need to comment any extra packages out in config/app.php while you do it
Do you use the laravelcollective/html package? It isn't updated to the new laravel version
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