Rebecca White is to lead Tasmanian Labor to the next election.
Ms White has replaced Bryan Green as opposition leader, following his overnight resignation.
She was the sole contender for the position, with current deputy leader Michelle O'Byrne also unchallenged, marking the first time either of the state's major parties has been lead by two women.
Ms White told reporters, "Bryan told us that he was choosing to step away from political life: it's always been Bryan's decision."
Mr Green will walk away from political life today after 19 years in Parliament, with three years as opposition leader and two terms as Deputy Premier.
"The last three years have been a fantastic experience for me," Mr Green said. "This period, from the point of view of the Labor Party, has been vitally important to show Tasmanians we are stable."
"Everyone knows that after the 2014 election and 16 years in government the Labor party lost badly.
"I was given the opportunity to draw the Labor party together after what were tumultuous times," he said.
The leadership change comes ahead of the next state election, due in 2018, and less than a fortnight after a poll showing just 20% support for Mr Green as Premier, compared to 52% for Will Hodgman.
Ms White said she's excited at the prospect of an early poll.
"We think Tasmanians are sick of this government; we think Tasmanians are looking for something different to what they've got.
"We think that Tasmanians feel let down by the Hodgman Liberal government, so there's no doubt that we're excited at what's to come next and we are ready for an early election if they bring it on," she said.