The Sass version of JointsWP supports Bower, which allows you to update the included libraries (under vendor/) with a single command. If you’re new to Bower and don’t have it installed, see Bower.io for installation instructions.
From the command line, navigate to your main theme directory. Then run: bower update
This will create a bower_components directory with updated versions of all your vendor files.
That’s it! You should see bower go through and update your packages to their newest version.
Using Gulp?
Simply run gulp bower to update all vendor files. This will create a bower_components directory with updated versions of the vendor files and automatically move these into the vendor/ directory.