Sean Horan's job is getting harder but better as the New Zealand Women's Sevens team continues its rapid development.

Horan named his 12-strong squad for the fourth leg of the World Rugby Women's Sevens Series in Canada next weekend, with three changes from the side which won in Atlanta last month.

Carla Hohepa, Charlotte Scanlan and Gayle Broughton return to the team in Vancouver, with Ruby Tui out injured and Alexis Tapsell and Morgan Morrow making way.

Although Tui's knee injury made one decision for Horan, he said picking the rest of the squad was more difficult than ever.

"They're looking really good," Horan said. "It's probably been the hardest team to pick so far.

"It's getting tougher and tougher [to pick a team], and it doesn't make my job any easier, but it makes it better.

"It's the quality of the group, they're growing, the internal competition, the progression of the girls, and we still haven't reached the peaks yet, we're still climbing Everest, so I'm very proud of the girls.

"We come [into camp] and it's all about quality, and it's only getting better."

New Zealand is coming off five straight tournament victories on the women's world series, and more than a year unbeaten in the series.

The last time New Zealand lost a match was February 23, 2014, to Australia in the Sao Paulo Sevens final.

Since then New Zealand have cleaned up the competition, winning in every way imaginable.

"We're learning to have that All Black sort of culture, I think," Horan said.

"We are never satisfied with our performances and always want to improve. We've had some great performances, we've thrashed teams, we've won well, we've won ugly, we've won tough.

"The main thing is we always work on finding a way to win, even when we're having an off day, because that's what you have to do at this level."

The Vancouver Sevens is a new addition to the women's world series, and will present a new set of challenges.

Horan said heading to a new location is always tough, but his team will be up for the challenge.

New Zealand plays England, Fiji and Spain in their Vancouver Sevens pool.

New Zealand Women's Sevens squad: Honey Hireme, Carla Hohepa, Hazel Tubic, Charlotte Scanlan, Sarah Goss (c), Gayle Broughton, Tyla Nathan-Wong, Kelly Brazier, Michaela Blyde, Selica Winiata, Portia Woodman, Kayla McAlister.