This is a follow up to [Referendum 46](https://polkadot.polkassembly.io/referendum/46), which failed because Polkadot did not have a default XCM version set. This protection, that the Relay Chain will not dispatch messages without a minimum safe version, was put in place after a previous vulnerability. Since this is the first cross-chain interaction that Polkadot has had, the version was not initialized.

The batch of calls contains the same two calls as Referendum 46, with an additional call to set the default XCM version of Polkadot to 2.

![](https://i.imgur.com/DLFYewu.png)
![](https://i.imgur.com/wJzxnkv.png)

- There was a previous vulnerability in Polkadot that caused a failed referendum.
- Polkadot did not have a default XCM version set.
- The batch of calls in this referendum includes setting the default XCM version to 2.
- There are two images showing the details of the referendum.
- The referendum is a follow-up to a previous one.

#134 Upgrade Shell to Statemint (with XCM Fix)