You now can update your Amazon DynamoDB global tables from version 2017.11.29 to the latest version with a few clicks in the DynamoDB Console
You now can update your global tables from version 2017.11.29 to the latest version of global tables (2019.11.21) with a few clicks in the DynamoDB Console. By upgrading the version of your global tables, you can increase the availability of your DynamoDB tables easily by extending your existing tables into additional AWS Regions, with no table rebuilds required. There is no additional cost for this update, and you will benefit from improved replicated write efficiencies after you update to the latest version of global tables.
Source:: Amazon AWS