Women have made up less than 25 percent of the hires in tech over the past 20 years. That needs to change, says Girls in Tech, a global nonprofit committed to diversity, equity and inclusion in the tech sector.

For Women’s Day, the group is launching a campaign called “Half the Board: 50/50 by 2025″—and is kicking off with an open letter to the tech community from its board members demanding gender parity in tech boardrooms.