The lower chamber of the Japanese parliament already approved the agreement in May.
The Comprehensive and Progressive Agreement for Trans-Pacific Partnership was signed in March after the United States' withdrawal. The new version of the agreement introduced changes in intellectual property rights, but left clauses on trade access, investment and state procurement unchanged.
US President Donald Trump has been critical of the partnership ever since his presidential campaign, pledging to withdraw. As a result, Trump signed a memorandum for US exit from the deal in January 2017.
The original TPP agreement was signed in 2016 and included Australia, Brunei, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore, the United States and Vietnam.