Cardano Activates Van Rossem Hard Fork
Cardano has activated the van Rossem hard fork, its first governance-approved network upgrade, reducing smart contract costs and preparing the blockchain for Ouroboros Leios.
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Cardano has activated the van Rossem hard fork, its first governance-approved network upgrade, reducing smart contract costs and preparing the blockchain for Ouroboros Leios.
Cardano Activates Van Rossem Hard Fork
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Written by
Felix Ng
staff editor
Reviewed by
Yohan Yun
staff editor
Written by
Felix Ng
staff editor
Reviewed by
Yohan Yun
staff editor
Cardano activates van Rossem hard fork
Latest News
Published
Jul 20, 2026
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.
Related:
Cardano Foundation cancels annual conference after failed funding vote
Ouroboros Leios is a scaling proposal for the Ouroboros proof-of-stake consensus used by Cardano, expected to launch in late 2026. Its goal is to drastically increase transactions per second without weakening Ouroboros’ security guarantees.
The van Rossem upgrade is also the
first
governance-driven hard fork in Cardano’s history, unlike previous upgrades that were coordinated by Input Output, the engineering company that designed and built the Cardano blockchain.
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