nix-config/renovate.json

{
    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
    "extends": ["config:base"],
    "lockFileMaintenance": {
        "enabled": true,
        "extends": ["schedule:daily"],
        "automerge": true
    },
    "nix": {
        "enabled": true
    }
}