Battle-tested nixpkgs using devenv's extensive testing infrastructure.
Currently, the only supported release is rolling.
Rolling is based upon nixpkgs-unstable plus a few patches that devenv needs which have not yet reached upstream:
You can check the latest tests here.
git fetch nixpkgs
git checkout nixpkgs/nixpkgs-unstable -B bump-rolling
git push origin bump-rolling -f
Then trigger a new test run on the CI.