# v2.1.4 Migration Guide
OverrideConfig enables users to override flow configurations from the API or when using Embed. Due to security concerns, it is now disabled by default.
Users must explicitly specify which config can be overriden from the UI.
1.) Go to Configuration:
2.) Enable Override Configuration:
3.) Turn on the toggle for the config that can be overriden and save it.
4.) For example, users can then override these variables and config. Refer to [OverrideConfig](https://docs.flowiseai.com/migration-guide/broken-reference).
```json
{
"overrideConfig": {
"systemMessage": "You are helpful assistant",
"vars": {
"character": "nice"
}
}
}
```
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