June 2026 Olympia Development Checkpoint Ethereum Classic Core Developers Read more: ethereumclassic.com/olympia Multi-client stability continued across codebases. Nethermind joins as a reference client. 🟢 Fukuii v0.8.x 🟠 Core-Geth v1.13.x 🔵 Besu v26.5.x 🟣 Nethermind v1.39.x (Ethereum Classic DAO)