The Mega Millions jackpot has climbed to $970 million, inching ever-closer to the $1 billion mark.

Officials raised the estimated jackpot yesterday for the second time because of strong sales ahead of tonight’s drawing.

The prize is the second-largest jackpot in U.S. history, behind only a $1.6 billion Powerball prize won in 2016.

No one has matched all six numbers and won the Mega Millions grand prize since July 24. That reflects the game’s long odds, at one in 302.5 million.

The $970 million refers to the annuity option, paid over 29 years. Most winners take the cash option, which would pay an immediate $513 million. About half of the jackpot winnings would go to taxes.