Please follow the [`CHANGES.md` modification guidelines](https://github.com/dcos/dcos/wiki/CHANGES.md-guidelines). Thank you!


## DC/OS 2.1.0 (in development)


### What's new


### Breaking changes


### Fixed and improved



Please follow the [`CHANGES.md` modification guidelines](https://github.com/dcos/dcos/wiki/CHANGES.md-guidelines). Thank you!


## DC/OS 2.1.0 (in development)


### What's new

* Updated DC/OS UI to [master+v2.148.8](https://github.com/dcos/dcos-ui/releases/tag/master+v2.148.8).

* Updated to [Mesos 1.9.0-rc3](https://github.com/apache/mesos/blob/5e79a584e6ec3e9e2f96e8bf418411df9dafac2e/CHANGELOG). (DCOS_OSS-5342)


### Breaking changes


### Fixed and improved

* Fixes increasing diagnostics job duration when job is done (DCOS_OSS-5494)


Include fixes in changes.md, which are already committed in DC/OS 2.1.0-dev.
Include fixes in changes.md, which are already committed in DC/OS 2.1.0-dev.
