A Russian Progress M-64 cargo ship docked on Saturday with the International Space Station, the Interfax news agency reported.
The cargo ship, launched early Thursday, docked with the ISS automatically, the report added.
The station's three-man crew, Russians Sergei Volkov and Oleg Kononenko and American Garrett Reisman, were expected to open the hatch to the cargo ship within a couple of hours.
Progress is delivering a three-tonne cargo of combustible energy materials, food, medicine, oxygen and water. These last were needed after a problem with static discharge was identified as coming from solar panels used to run the computers which control oxygen and water supplies on the ISS.