The potential deal involving two crop science giants with major operations in North Carolina keeps getting bigger as Bayer AG ups its offer again for Monsanto.

The Leverkusen, Germany-based drug and chemicals company said in a statement early Tuesday it was offering $127.50 per Monsanto share, up from the previous $125 a share offer. Excluding debt of about $9 billion, that values Monsanto at $55.8 billion, about $1 billion more than the previous offer.

On July 15, Bayer raised its offer to $125 per share.

It gave no further details on the latest takeover bid and said “there can be no assurance that the parties will enter into an agreement.”

Monsanto, based in St. Louis, Missouri, has already rejected two offers from Bayer and described the previous offer in July inadequate.

At the time, the company said it remained open to talks with Bayer and others about a deal.

Monsanto confirmed the new Bayer bid but would not comment further as it evaluates it.

Bayer began its bid for Monsanto in May.