> ## Documentation Index
> Fetch the complete documentation index at: https://docs.microsandbox.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Week of September 25, 2026

> v0.7.3 fixes for saved sandbox configuration and macOS runtime discovery, plus snapshot upgrade guidance.

<Tip>
  **Released this week:** [v0.7.3](https://github.com/superradcompany/microsandbox/releases/tag/v0.7.3)
</Tip>

## Fixes

* **Existing sandbox configuration.** v0.7.3 migrates saved v0.6 secret policies, including Basic Auth and query substitution settings, so existing sandboxes can load without being deleted and recreated.
* **macOS runtime discovery.** Starting microsandbox through a symlink now finds the matching `libkrunfw` library in the installation directory.

## Upgrading snapshot code from v0.6

Local snapshot groups introduced in v0.7 have immutable members. This behavior also applies in v0.7.3. SDK calls with `force=True` fail even when no snapshot exists under the requested name.

Code that previously overwrote a named snapshot must change:

```python Before: v0.6 theme={null}
from microsandbox import Snapshot

snapshot = await Snapshot.create(
    "checkpoint", from_sandbox="workbench", force=True
)
```

Omit the name to generate a new member for each capture, and leave `force` at its default of `False`:

```python After: v0.7 theme={null}
from microsandbox import Snapshot

snapshot = await Snapshot.create(from_sandbox="workbench")
```

You can also supply a unique member name. If you need to reuse an existing name, explicitly remove that member first using [`Snapshot.remove()`](/sdk/python/snapshots#snapshotremove). Removal still checks for dependent snapshots, and deleting a member does not preserve it if the next capture fails.

This restriction applies to installed group members. Direct archive capture can overwrite its output file. See [snapshot groups](/sandboxes/snapshots#snapshot-groups) and the [Python snapshot reference](/sdk/python/snapshots).