Unable to use Laravel's s3 driver after running composer update

I ran a composer update and ever since, if I try do a s3 bucket call it fails 500 with no stack trace. I am using hhvm -v 3.8.1 and laravel -v 5.1

My s3 call:

Storage::disk('s3')->exists('file.txt')

Not quite sure what information to give. There is just no stack trace.

via Chebli Mohamed