Admob Notification 22/12/17. Please, What does it mean?

 what does it mean when admob says ;  

Beginning Jan 23, 2018, Google Mobile Ads SDK versions older than 7.0.0 for Android and 7.0.0 for iOS will no longer be supported. Publishers with these older versions will not be able to serve ads in their apps(s). Please ensure that you have upgraded to the latest version of the Google Mobile Ads SDK.
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