Cardano activates van Rossem hard fork, paving way for Ouroboros Leios upgrade

The Cardano blockchain has activated the van Rossem hard fork, which reduces smart contract execution costs for developers and users. The upgrade also lays the groundwork for Ouroboros Leios, a major scalability improvement expected to launch later in 2026. It marks one of the most significant development milestones for the Cardano ecosystem in recent months.