angular
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automatic-ish upgrades
So Gemnasium has this thing where it can automatically upgrade your packages for you via pull request. I believe this is free to do for 2 packages.

Theoretically, then, when angularcore releases a new version, Gemnasium can send a PR with the updated dependency.
After that you'd just have to bump version and tag, or figure out some way to automate further.
At the very least it can let you know when the angular is updated.