Before creating the VSIX
package containing an updated version of your extension, you need to increase the version number in the package manifest (either do it via the VSIX
designer, or change the Version
-attribute of the PackageManifest/Metadata/Identity
element via the XML editor). Otherwise the gallery won´t recognize the new package as an update.
Upload the package again (verify and save all changes); you should immediatly see the new version in Visual Studio´s extensions dialog.