Found this tool called mas-cli which provides a command line interface to the Mac App Store. You can install via Homebrew:

$ brew install mas

You can list apps:

$ mas list

443987910 1Password (6.6.4)
587512244 Kaleidoscope (2.1.0)
405399194 Kindle (1.12.4e)

Or upgrade a specific app:

$ mas upgrade 405399194

Or you can update everywhere app (including Xcode):

$ mas upgrade

Don't forget the option to run multiple versions of Xcode side-by-side by getting it directly from Apple's Developers Website.

Learn more about cli-mas.

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