# Arbitrum Classic Monorepo
This repo represents the old "classic" Arbitrum tech stack; Arbitrum One was upgraded to use the Nitro tech in August of 2022.
For the current Arbitrum Nitro codebase, see [Nitro](https://github.com/OffchainLabs/nitro).
- [Discord](https://discord.gg/ZpZuw7p)
- [Developer guide](https://developer.offchainlabs.com)
This repository is offered under the Apache 2.0 license. See LICENSE for details.