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Note: at the time of this writing, the 4.7-5.x branch contains all code required to upgrade from 4.7.5→5.1.1 as well as 5.1.1→ 6.0.0. Shortly this branch will be merged into the main branch and a release will be cut. If you find that the 4.7-5.x branch doesn't exist, go ahead and build from main.