code: def check_pypi_updates(dependencies):
      
      dependencies_up_to_date = []
      for dependency in dependencies.get('pypi', []):
          # get latest version from PyPI api
          try:
              latest_version = get_latest_version_number(dependency.project_name)
          except Exception as error:
              logger.warning("--check-updates command will be aborted. Error: %s", error)
              return dependencies
          # get required version
          required_version = None
          if dependency.specs:
              _, required_version = dependency.specs[0]
  
          if required_version:
              dependencies_up_to_date.append(dependency)
              if latest_version > required_version:
                  logger.info("There is a new version of %s: %s",
                              dependency.project_name, latest_version)
              elif latest_version < required_version:
                  logger.warning("The requested version for %s is greater "
                                 "than latest found in PyPI: %s",
                                 dependency.project_name, latest_version)
              else:
                  logger.info("The requested version for %s is the latest one in PyPI: %s",
                              dependency.project_name, latest_version)
          else:
              project_name_plus = "{}=={}".format(dependency.project_name, latest_version)
              dependencies_up_to_date.append(pkg_resources.Requirement.parse(project_name_plus))
              logger.info("The latest version of %r is %s and will use it.",
                          dependency.project_name, latest_version)
  
      dependencies["pypi"] = dependencies_up_to_date
      return dependencies
docs: Return a list of dependencies to upgrade.