Why has coverage been locked to `==4.0.3` for two years? Why not `>=4.0.0`?

If I add localstack to my pipenv, I can't lock because of this unnecessary dependency.
import psutil
        if not self.process:
            LOGGER.warning("No process found for command '%s'" % self.cmd)
            return
        parent_pid = self.process.pid
        try:
            parent = psutil.Process(parent_pid)
            for child in parent.children(recursive=True):
                child.kill()
            parent.kill()
            self.process = None
        except Exception:
            if not quiet:
                LOGGER.warning('Unable to kill process with pid %s' % parent_pid)
class JsonObject(object):
    def to_json(self, indent=None):
        return json.dumps(self,
            default=lambda o: ((float(o) if o % 1 > 0 else int(o))
                if isinstance(o, decimal.Decimal) else o.__dict__),
            sort_keys=True, indent=indent)
    def apply_json(self, j):
        if isinstance(j, str):
            j = json.loads(j)
        self.__dict__.update(j)
    def to_dict(self):