July 22, 2026

Cardano activates van Rossem hard fork, paving way for Leios

 Cardano activates van Rossem hard fork, paving way for Leios

The upgrade reduces smart contract execution costs while laying the groundwork for Ouroboros Leios, a major scalability upgrade expected later this year.

Cardano has activated its van Rossem hard fork as of Saturday, upgrading the Cardano mainnet to version 11, which is expected to lower smart contract execution costs and lay the groundwork for Ouroboros Leios, a major scalability upgrade for the protocol.

Onchain data from Cardanoscan shows the network moved from Protocol Version 10 in epoch 643 to Version 11 in epoch 644.

“As well as Plutus improvements and Plutus Cost Model enhancements, this upgrade lays the foundation for the next upgrade, the Dijkstra era hard fork, which will introduce Ouroboros Leios to Cardano,” Input Output wrote in a weekly development report on Friday.

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  • Crystal Kim is a New York-based markets and investing reporter with more than 10 years of experience. Prior to joining Investopedia in July 2025, she covered crypto for Axios.

Crystal Kim

Crystal Kim is a New York-based markets and investing reporter with more than 10 years of experience. Prior to joining Investopedia in July 2025, she covered crypto for Axios.

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