Travelers Cos. will replace Citigroup Inc. – with whom it at one time had merged — on the Dow Jones Industrial Average, as the index seeks to update its listing in the wake of the Citigroup’s ongoing restructuring.

Robert Thompson, editor-in-chief of Dow Jones, announced the change, as well as Cisco Systems replacing General Motors Corp., which filed for bankruptcy June 1. The changes will take effect June 8.

Travelers’ inclusion as one of the 30 companies on which the day’s Dow Jones’ financial results are based also bolsters the financial stock sector, which had been underrepresented when Kraft Foods replaced American International Group Inc., the New York-based insurance and financial services company that has received nearly $170 billion in federal aid, last fall.

Eleven years ago, Travelers, the property-casualty insurer, merged with Citigroup to create a one-stop shop for financial services and insurance. Four years later, Travelers was spun off.