The previous toll was 239.The broadcaster, citing Iran's Haj and Pilgrimage Organisation, added that 14 more Iranian pilgrims were still receiving treatment in Saudi Arabia where the stampede occurred.
Saudi Arabia has said that 769 pilgrims died in the September 24 crush during a major haj ritual in the Saudi holy city of Mina.
Saudi authorities have not provided a breakdown of nationalities of the victims.
The tragedy has triggered a row between Iran and its regional rival, Saudi Arabia.
Iran has repeatedly accused Saudis of incompetence in handling the haj.
Saudi Arabia has hit back, accusing Iran of trying to politically manipulate the disaster, the haj's worst in 25 years.
Nearly 2 million Muslims attended this year's haj.