old_contents: """Dependency injector top-level package."""
  
  VERSION = '2.2.0'
  """Version number that follows semantic versioning.
  
  :type: str
  """
  
new_contents: """Dependency injector top-level package."""
  
  VERSION = '2.2.1'
  """Version number that follows semantic versioning.
  
  :type: str
  """
  
subject: Increment version to 2.2.1