ConTeXt Standalone/TeX Live

From ConTeXt wiki

Show packages to be updated

tlmgr -location http://minimals.contextgarden.net/texlive/beta update --list

Update all packages

tlmgr -location http://minimals.contextgarden.net/texlive/beta update --all

Install only a single file

tlmgr -location http://minimals.contextgarden.net/texlive/beta update context-packagename
tlmgr install -reinstall packagename