Vagrant 2.2.6 introduces two new features, Dependency Provisioners and Box Checksum Validation. Dependency Provisioners allow users to control when their provisioners run for a given guest by giving them before or after options that refer to Root Provisioners. This feature is experimental and requires enabling the VAGRANT_EXPERIMENTAL environment variable. The new feature provides finer-grained control over the run order of provisioners, allowing users to specify if a provisioner should run more than once. Box Checksum Validation allows Vagrant to automatically validate that the downloaded box matches the checksum before unpacking, with support for SHA256, SHA384, and SHA512 added in this release.