For updates on the Department of Peacebuilding bill currently in Congress, you can sign up for email updates from The Peace Alliance. This would include any news about the Department of Peacebuilding legislation in addition to any other news they have. After clicking on the link, you can visit the "Take Action" tab and send an email to your Member of Congress asking them to become a co-sponsor if they haven't done so yet.
Just a quick update since many of you have asked. The Department of Peacebuilding bill is introduced into every new session of Congress. It currently has 26 cosponsors and is bill HR-1111.