# How to do a runtime upgrade

- You need to poses the sudo keys for the chain
- Make sure the runtime spec_version is incremented
- You need to compile the newest chain. A `cargo clean` before that would be advisable.
```shell
cargo clean
```
```shell
cargo build --release
```
- You need to call the sudo.sudo(call) on system.setCode(code) extrinsic with the sudo keys

`sudo.sudo(system.setCode(your_chain.compact.compressed.wasm)) `

- As the "code" argument you need to upload the `g6_solo_runtime.compact.compressed.wasm` from the target folder `target/release/wbuild/g6-solo-runtime/` 

![sudo.sudo.system.setCode.png](pictures/sudo.sudo.system.setCode.png)

- To confirm the upgrade was successful you should see the new spec_version in the PJS UI top left 

Eg. before: `g6-solo-chain/102`. After `g6-solo-chain/103`

![runtime.upgrade.successful.png](pictures/runtime.upgrade.successful.png)

## More info
https://docs.polkadot.com/develop/parachains/maintenance/runtime-upgrades/