2016/7/27 にこんなアップデートがあったようです。 Changelog - We've added the option to auto-cancel redundant builds. Read more, and how to enable it, here: https://t.co/MTjOV7ttkF— CircleCI (@circleci) July 26, 2016 Project Settings → Advanced Settings に設定項目があります。 With the exception of your default branch, we will automatically cancel any queued or running builds on a branch when a newer build is triggered on that s