Meteor build breaking on deployment to Heroku
The buildpack first installs Meteor 1.3 then checks against your apps's requirement then changes it back to Meteor 1.2. The update/downgrade back to 1.2 does not always resolve dependencies correctly Cannot downgrade. This could be one reason the dependency node version requirements are not being met. You will need to either resolve the dependency issue locally with 1.3 then deploy using the buildpack, or use a buildpack that installs 1.2.