Cardano Deploys First Community-Approved Hard Fork Ahead of Leios Rollout

Cardano has successfully activated its Van Rossem protocol upgrade, bringing Protocol Version 11 to the network and marking the beginning of a new phase in the blockchain's technical development. The upgrade went live on July 18, following weeks of testing, infrastructure upgrades, and approval through Cardano's decentralized governance system.

Intersect, the member-based organization supporting Cardano's ecosystem, confirmed the successful deployment, describing the activation as the culmination of extensive preparation across the network.

Cardano Community Approves Van Rossem Upgrade

The Van Rossem upgrade received formal approval on July 13 after securing the required support from Delegated Representatives (DReps), Stake Pool Operators (SPOs), and the Constitutional Committee under Cardano's governance framework.

According to Cardano's governance records, 77.63% of DReps and 52.7% of SPOs voted in favor of adopting Protocol Version 11, exceeding the thresholds required for implementation.

Van Rossem is classified as a protocol upgrade within the current Conway era, meaning the network remains in the same governance era while introducing significant changes to its core protocol.

Upgrade Brings Plutus Enhancements and Lower Smart Contract Costs

One of the key objectives of Van Rossem is to enhance Plutus, Cardano's smart contract platform.

The upgrade introduces new Plutus capabilities alongside revisions to the protocol's cost model designed to reduce the execution costs of certain smart contract operations. It also includes several technical improvements aimed at increasing the efficiency of decentralized applications while strengthening overall network performance.

Months of Testing Preceded Mainnet Activation

Before reaching the main network, Van Rossem underwent an extensive testing process.

Cardano first deployed Protocol Version 11 on its preview testnet in May, followed by the pre-production network in June after developers resolved tooling compatibility issues.

Following successful testing and infrastructure readiness, a proposal to upgrade the mainnet was submitted in June, approved through governance in July, and activated on July 18.

Van Rossem Lays the Foundation for Dijkstra and Ouroboros Leios

Beyond its immediate technical improvements, Van Rossem is designed to prepare Cardano for the next stage of its roadmap.

According to Input Output, the company behind Cardano's core research and engineering, the upgrade establishes the foundation for the upcoming Dijkstra era, which will introduce Ouroboros Leios, the network's next-generation consensus enhancement.

Ouroboros Leios is expected to significantly increase transaction throughput while preserving Cardano's existing security model and decentralization principles.

Development of Leios remains ongoing. Cardano's latest weekly development report noted that the consensus team continues testing the protocol, releasing new experimental versions and implementing improvements aimed at increasing block adoption rates.

First Protocol Upgrade Approved Through Decentralized Governance

Van Rossem also represents an important governance milestone.

It is the first protocol upgrade implemented entirely through Cardano's Voltaire governance framework, replacing the previous model in which major network upgrades were coordinated primarily by founding organizations and core developers.

Under the new governance structure, the final decision to adopt protocol changes rests with DReps, Stake Pool Operators, and the Constitutional Committee after technical teams complete development and testing.

The activation serves as one of the first large-scale demonstrations of Cardano's decentralized decision-making process in practice.

Community Governance Continues to Shape Cardano's Roadmap

The Van Rossem upgrade reflects Cardano's broader strategy of placing greater control over network development in the hands of its community.

The governance system has already influenced several major decisions. Earlier this year, community members voted against a proposal requesting 7.8 million ADA to fund the 2026 Cardano Summit, resulting in the event's cancellation. At the same time, other development initiatives, including Leios, Hydra, and Mithril, have continued receiving support through alternative funding channels.

Cardano Advances Toward Its Next Scalability Phase

With Protocol Version 11 now live, Cardano's development efforts are shifting toward the implementation of Dijkstra and Ouroboros Leios, both of which are expected to play a central role in the network's long-term scalability strategy.

While no official mainnet launch date has been announced for Leios, the project continues to progress through testing, with major scalability upgrades widely expected to move closer to deployment during 2026.

Beyond the technical improvements introduced by Van Rossem, the upgrade highlights Cardano's evolving governance model. By transferring responsibility for protocol upgrades from its founding organizations to the community, the network is putting decentralized governance to a practical test. As competition among blockchain platforms intensifies, the long-term success of Van Rossem will ultimately depend not only on a smooth deployment, but on whether its performance improvements, lower execution costs, and governance framework translate into stronger developer activity and broader ecosystem growth.