You must update the “version” field in your .plist and then send the new binary.
The application page has a “Add Version” button in the lower right corner, as shown below: 
Click "Add Version", specify what is updated / fixed / updated in the new version, make sure that all other fields are correct, and then send.
After that, you will have to use the Application Loader (Mac App) to download your binary.
No matter how small or small the updates are, you need to add a new version. Please note that the current version will not be removed from the repository, so you will not lose sales (or download).
Also, note that while there are technical ways to get around this a bit (for example, by downloading dynamic code from the Internet), such practices are strictly prohibited and will reject your application.
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