Lawyers from the country's hydrocarbons regulator ANP had asked the supreme court to overturn the injunction, which was filed by engineers from Rio de Janeiro, STF said in a statement.
The supreme court last month overturned a similar injunction, arguing the suspension of round eight put national security at risk.
The eighth round probably will take place before the ninth, which is scheduled for November 27-28, ANP director Nelson Narciso told journalists last month.
In the eighth round, 23 companies won 38 blocks before the injunction suspended the auction.
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