The Biden administration warned Beijing of its plans to update rules that curb shipments of AI chips and chipmaking tools to China as soon as early October, a U.S. official said, a policy decision aimed at stabilizing relations between the superpowers. The Commerce Department, which oversees export controls, is working on an update of export restrictions first released last year. The update seeks to limit access to more chipmaking tools in line with new Dutch and Japanese rules, other sources said, and to close some loopholes in export restrictions on artificial intelligence (AI) chips. "The PRC has been expecting an…