Lyft, the second-largest ride hailing company in the United States, is trying to raise more money just as Uber, its bigger rival, grapples with questions about its culture and leadership.

Lyft is talking with investors about new fund-raising that would put the company’s value around $6 billion, according to three people briefed on the financing who asked to remain anonymous because the proceedings are confidential. One of the people said the valuation could be as high as $7 billion.

The company was valued at $5.5 billion early last year after investors, including General Motors, poured about $1 billion into it. It is unclear how far along Lyft is with the new fund-raising and whether the round will be completed.

Lyft, which is based in San Francisco, declined to comment. The funding effort was earlier reported by The Wall Street Journal.