# History and changes

This is a history of changes to the Terra core.

## Columbus-5

Columbus-5 is the current Terra Mainnet.

- [Mainnet Changelog](https://github.com/terra-money/core/blob/main/CHANGELOG.md)
- [Columbus-5 Upgrade Guide](https://github.com/terra-money/mainnet/wiki/Columbus-5-Upgrade-Instructions)
- [Wallet Migration Guide](https://github.com/terra-money/mainnet/wiki/Columbus-5-Wallet-Migration-Guide)
- [Contract Migration Guide](https://github.com/terra-money/mainnet/wiki/Columbus-5-Contract-Migration-Guide)

### Previous mainnets

- [Columbus 4 Changelog](https://github.com/terra-money/core/blob/main/CHANGELOG.md#045)
- [Columbus 3 Changelog](https://github.com/terra-money/core/blob/main/CHANGELOG.md#030)
- [Columbus 2 Changelog](https://github.com/terra-money/core/blob/main/CHANGELOG.md#020)
- [Columbus-1 Changelog](https://github.com/terra-money/core/blob/main/CHANGELOG.md#150-market-swap-protections)

## Medium archives

- [2018](https://medium.com/terra-money/archive/2018)
- [2019](https://medium.com/terra-money/archive/2019)
- [2020](https://medium.com/terra-money/archive/2020)
- [2021](https://medium.com/terra-money/archive/2021)