Removed in https://github.com/serokell/deploy-rs/commit/6fc0024f184b34089175722778e331b1e5ddadff From the README: ``` overlays = [ deploy-rs.overlay # or deploy-rs.overlays.default (self: super: { deploy-rs = { inherit (pkgs) deploy-rs; lib = super.deploy-rs.lib; }; }) ]; ``` which I think should read: ``` overlays = [ deploy-rs.overlays.default (self: super: { deploy-rs = { inherit (pkgs) deploy-rs; lib = super.deploy-rs.lib; }; }) ]; ```