Cardano Plans Two-Phase Dijkstra Upgrade With Leios and Peras

Cardano has outlined a two-phase rollout for its upcoming Dijkstra era. Phase 1, targeting Q4 2026 code completion, will activate Ouroboros Linear Leios (CIP-164) to increase throughput through supplementary Endorser Blocks, while also introducing nested transactions (CIP-118), guard scripts (CIP-112), account-address enhancements (CIP-159) and simpler staking-reward withdrawals (CIP-181).

Phase 2, targeted for Q2 2027, will activate Ouroboros Peras (CIP-140), adding a stake-pool voting layer designed to accelerate settlement. Both phases will undergo testnet deployment and on-chain governance approval before mainnet activation.