> For the complete documentation index, see [llms.txt](https://docs.rigoblock.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rigoblock.com/solidity-api-reference/protocol/extensions/adapters/interfaces/iminimumversion.md).

# IMinimumVersion

## IMinimumVersion

### requiredVersion

```solidity
function requiredVersion() external view returns (string)
```

Returns the minimum implementation version to use an external application.

*Adapters must implement it when modifying proxy state or storage.*

#### Return Values

| Name | Type   | Description                              |
| ---- | ------ | ---------------------------------------- |
| \[0] | string | String of the minimum supported version. |