Removing a new app version from iTunes Connect

You cannot remove the new version but you can change its version number, as long as you're in the Prepare for Submission state (ie. you might need to remove the build from waiting for review, also known as rejecting the binary, first). Here's how.

To edit the version number, select the falsely numbered version on the left on iTunes Connect (so NOT the "App Information", but under that the version "1.0.1 Prepare for Submission" etc), scroll down in the right pane to "General App Information" -- just below the App Icon you can see the version number and it's editable! Change it, hit save, and you'll see the version number change on the left side.

Update: Still valid in May of 2021.

You cannot remove the new version but you can modify version number,so follow the step.

 1. Go to

https://appstoreconnect.apple.com/

and Open the app which you want to modify the version number

 2. Go to below step and change the number which you want and display quick response on left panel.

Log on to itunes connect, then click on the My Apps.Here we have thumbnails of apps. Click on the app which u have uploaded wrongly. then u will c like this "You can edit all information while your version is waiting for review. To submit a new build, you must remove this version from review."

click on the link to delete the binary.