The Iranian announcement marks the latest breach of the accord. In May, Iran stepped up its production of enriched uranium, which can be used to make fuel for reactors but also for nuclear weapons.
The country has already stockpiled more enriched uranium than permitted under the terms of the deal.
Deputy foreign minister Abbas Araqchi said Iran still wanted to salvage the deal but blamed European countries for failing to live up to their own commitments.
The US unilaterally withdrew from the agreement in 2018.
It has since reimposed strict sanctions on Iran.
Recall that the agreement was aimed at ensuring that Tehran's nuclear program "will be exclusively peaceful" in return for the lifting of sanctions.