US ridesharing giant Lyft announced Thursday it has received a $1 billion investment led by the venture arm of Google parent Alphabet, to help ramp up its challenge to market leader Uber.

Lyft said the new funding gives it a valuation of $11 billion as it steps up competition against Uber, reeling from a series of missteps and scandals which have forced out its founder and .

A Lyft blog post said the new funding round was led by CapitalG, formerly known as Google Capital, which invests in emerging .

Lyft has been expanding in the US market as Uber's image has taken a hit in recent months. It has also been expanding its partnerships including with General Motors and the former Google Car unit now called Waymo.

"2017 has been an important year for the Lyft community. Earlier this month, we completed our 500 millionth ride and our service is now available to 95 percent of the US population—up from 54 percent at the beginning of the year," the statement said.

"While we've made progress towards our vision, we're most excited about what lies ahead. The fact remains that less than 0.5 percent of miles traveled in the US happen on rideshare networks. This creates a huge opportunity to best serve our cities' economic, environmental, and social futures."

The new creates a potential conflict for Alphabet, which was one of the early investors in Uber.

Uber, which has a valuation of nearly $70 billion, is widely expected to seal a deal for a major investment from Japan's Softbank, which could allow some stakeholders to cash out.

Uber board member Ariana Huffington said this week she expects a Softbank announcement soon.