Iran has carried out a second test of its Zuljanah satellite launcher, Iranian state TV reported on Sunday.
The move came amid plans to resume indirect talks between Iran and the United States to revive its landmark 2015 nuclear deal.
The United States fears such long-range ballistic technology used to put satellites into orbit could also be used to launch nuclear warheads. Tehran denies the accusation.
"The third development phase of the Zuljanah satellite launcher will be based on a combination of information gained during today's launch," a defence ministry spokesperson told state TV, without clarifying whether the test was successful.
Last year, the United States voiced concern over the successful launch of the domestically-made satellite launcher for the first time, which Tehran said was aimed at helping achieve its “most powerful rocket engine”.
The Zuljanah is a three-stage satellite launcher using a combination of solid and liquid fuels.