addition, you can access environment variables and perform essential actions
such as starting, stopping, or deleting containers.
- Find public Docker Hub images, local images, or images from remote
repositories.
- Discover more about specific extensions and install them.
- Navigate through your volumes and gain insights about the associated
containers.
- Search and access Docker's documentation.
#### For Mac
- Fixed a bug that prevented Docker Desktop from starting. [docker/for-mac#6890](https://github.com/docker/for-mac/issues/6890)
- Resource Saver is now available on Mac. It optimises Docker Desktop's usage of your system resources when no containers are running. To access this feature, make sure you have [turned on access to experimental features](/manuals/desktop/settings-and-maintenance/settings.md) in settings.
#### For Windows
- Fixed a bug where the self-diagnose tool showed a false-positive failure when vpnkit is expected to be not running. Fixes [docker/for-win#13479](https://github.com/docker/for-win/issues/13479).
- Fixed a bug where an invalid regular expression in the search bar caused an error. Fixes [docker/for-win#13592](https://github.com/docker/for-win/issues/13592).
- Resource Saver is now available on Windows Hyper-V. It optimises Docker Desktop's usage of your system resources when no containers are running. To access this feature, make sure you have [turned on access to experimental features](/manuals/desktop/settings-and-maintenance/settings.md) in settings.
## 4.21.1
{{< release-date date="2023-07-03" >}}
#### For all platforms
- Fixed connection leak for Docker contexts using SSH ([docker/for-mac#6834](https://github.com/docker/for-mac/issues/6834) and [docker/for-win#13564](https://github.com/docker/for-win/issues/13564))
#### For Mac
- Removed configuration health check for further investigation and addressing specific setups.
## 4.21.0
{{< release-date date="2023-06-29" >}}
### New
- Added support for new Wasm runtimes: slight, spin, and wasmtime. Users can download Wasm runtimes on demand when the containerd image store is enabled.
- Added Rust server support to Docker init.
- Beta release of the [**Builds** view](use-desktop/builds.md) that lets you inspect builds and manage builders. This can be found in the **Features in Development** tab in **Settings**.
### Upgrades
- [Buildx v0.11.0](https://github.com/docker/buildx/releases/tag/v0.11.0)
- [Compose v2.19.0](https://github.com/docker/compose/releases/tag/v2.19.0)
- [Kubernetes v1.27.2](https://github.com/kubernetes/kubernetes/releases/tag/v1.27.2)
- [cri-tools v1.27.0](https://github.com/kubernetes-sigs/cri-tools/releases/tag/v1.27.0)
- [cri-dockerd v0.3.2](https://github.com/Mirantis/cri-dockerd/releases/tag/v0.3.2)
- [coredns v1.10.1](https://github.com/coredns/coredns/releases/tag/v1.10.1)
- [cni v1.2.0](https://github.com/containernetworking/plugins/releases/tag/v1.2.0)
- [etcd v3.5.7](https://github.com/etcd-io/etcd/releases/tag/v3.5.7)
### Bug fixes and enhancements
#### For all platforms
- Docker Desktop now automatically pauses the Docker Engine when it is not in use and wakes up again on demand.
- VirtioFS is now the default file sharing implementation for new installations of Docker Desktop on macOS 12.5 and higher.
- Improved product usage reporting using OpenTelemetry (experimental).
- Fixed Docker socket permissions. Fixes [docker/for-win#13447](https://github.com/docker/for-win/issues/13447) and [docker/for-mac#6823](https://github.com/docker/for-mac/issues/6823).
- Fixed an issue which caused Docker Desktop to hang when quitting the application whilst paused.
- Fixed a bug which caused the **Logs** and **Terminal** tab content in the **Container** view to be covered by a fixed toolbar [docker/for-mac#6814](https://github.com/docker/for-mac/issues/6814).
- Fixed a bug which caused input labels to overlap with input values on the container run dialog. Fixes [docker/for-win#13304](https://github.com/docker/for-win/issues/13304).