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After about an hour of debugging and discussion in the #laravel IRC channel it became apparent that this is caused by [Dotenv](https://github.com/vlucas/phpdotenv) being set to immutable by default, something which Laravel does not provide a means to alter.\r\n\r\nI propose adding a trigger which developers can use by adding an environment value:key pair to their Homestead.yaml file. If this is found, Dotenv will be set to mutable and it will then be possible to override YAML-defined environment variables on a per-project basis while still providing a catch-all default value.\r\n\r\nThis will not change how Laravel and Homestead operate for the vast majority of users, and environment variables will remain immutable by default. However, it will provide a quick and easy way to make them mutable for those who feel they benefit from it.\r\n\r\n```yaml\r\nvariables:\r\n    - key: VAR_MUT\r\n      value: 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