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composer.jsonwhere the required versions are more explicitly stated. But if you don't set specific versions, better to commit thecomposer.lock. It's confusing if the versions specified incomposer.jsonare different than those installed as per acomposer.lock. Also it depends on the app (in-house or general release) and its dev cycle. Of course, the composer docs do say, in bold, "Commit your application's composer.lock (along with composer.json) into version control". Choose wisely =)composer.json. In therequiresection, you can put:"repo": "dev-master#2633721877cae79ad461f3ca06f3f77fb4fce02e". This will 1) go to the branch, 2) checkout that hash, 3) if the hash is not found on the branch, however, it will checkout the head of the specified branch (master in this case).