Concepts and technologies are described herein for using virtual machines to manage software builds. A deployment controller manages deployment of a new software build. The deployment controller installs the new software build on test device and tests the new software build. If the new software build functions without errors, the new software build is deployed to hosts of a data center and monitored for errors. If errors are detected, the errors are reported to a developer associated with the new software build. In some embodiments, the deployment controller creates a differencing disk storing differences between the updated software build and an existing software build and uses the differencing disk for installing the new software build for testing and/or for deploying the new software build.