That is a work in progress and the infrastructure should be online very soon. Currently the General registry just mirrors that of METADATA (previous registry for 0.x versions). The plan is to migrate those packages that declare support for 1.x.y and purge does that do not. In the short-term, GitHub - JuliaCI/PkgEval.jl: Keeping tabs on the julia ecosystem is the project being developed to replace https://pkg.julialang.org/ for the 0.x.y version of the language. I would recommend always running Pkg.test(Pkg) before using any package in 1.x.y for the time being.