If you are using a relatively new version of npm (I used version 2.14.2) you can bump the version number in package.json and npm update dep_1
should work. Otherwise how can npm know that something needs to be updated?
Note: This will only work if the version is higher than what has previously been installed. You will have to clean the cache to reset this behaviour.
However, you can forceably (and lazily) update local modules by simply running npm install
again. e.g.
npm install dep_1
It should be fast since its on your local computer and you don't have to play around with version numbers.
For more detail see the discussion about this issue on the official npm repository page: https://github.com/npm/npm/issues/7426
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