Laravel 5.2 - Class 'GuzzleHttp\Client' not found, on live server only

I have my config/mail 'driver' set to mandrill, host, port, etc. including in services.php mandrill secret set.

Sending Mail works fine locally, but on the live server I get: Class 'GuzzleHttp\Client' not found

I have tried "guzzlehttp/guzzle": "~5.3|~6.0", and then back to "guzzlehttp/guzzle": "~4.0", no luck. I have done composer update, and dump-autoload still no luck on my live server. Been through every other associated Stackoverflow question and still can't resolve.

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