The van Rossem hard fork upgrade for the Cardano Mainnet has officially commenced. The process coordinates two distinct governance actions: a Plutus Cost Model parameter update (enacted on June 18) and the hard fork initiation action (submitted on June 16). Following successful testing on the Preview and Preprod testnets, the final decision to ratify and execute the upgrade now rests entirely with the on-chain governance bodies (DReps, SPOs, and the Constitutional Committee).

The High Assurance team launched a smart contract testing beta tool, while the Mithril team completed its SNARK-friendly genesis certificate and optimized recursive scaling primitives. Under Voltaire, a critical call for candidates was issued for the upcoming Constitutional Committee election to ensure a competitive process. Finally, the Research team had its Cardano Vision 2026 proposal officially ratified by the community with 74.96% DRep approval.

The CCI V2 Roundtable Talk gathers Pentad representatives to review a joint proposal focused strictly on maintaining critical core infrastructure and establishing an upgrade framework. The session covers the role of the new Steering Committee, treasury oversight, and how operational choices were prioritized. Notably, the proposal excludes funding for DApps, liquidity, or marketing, and serves as an objective, auto-dubbed review rather than a promotional event.

The LayerZero integration connects Cardano to the wider crypto economy, enabling over 800 tokens to move natively onto the network. These assets will benefit from Cardano's built-in ledger security and deterministic smart contracts. The rollout will proceed in phases through 2026 launching endpoints, the Stargate liquidity layer, and developer tools with the goal of supporting any asset by year-end.

The Cardano Accelerator Program (CAP) is inviting subject matter experts to join its mentor network for the Fall 2026 cohort, themed Real-World Trust. Mentors will provide flexible, one-on-one guidance to startups focused on identity, traceability, and digital passports. This non-commercial engagement offers industry experts ecosystem-wide visibility in exchange for mentoring in strategy, compliance, or fundraising. Applications opened on June 5, 2026, for a one-month window.

The consensus team advanced the Leios prototype toward the Dijkstra era and finalized the certificate size reduction to 200 bytes. In wallets, Lace 2.0.6 went live, fixing DRep ID message signing for mnemonic wallets and adopting the CIP-129 format. For scaling, Hydra merged its partial fanout feature to eliminate the UTXO limit per head, while Mithril completed circuit key caching for its SNARK library.

The Ouroboros Leios architecture solves the blockchain trilemma by decoupling transaction diffusion from sequencing. This setup integrates advanced cryptography, including SNARKs for sublinear correctness verification, Data Availability Sampling (DAS) to verify blocks without full downloads, and Bloom filters to check data relevance. Finally, UTXO sharding distributes state maintenance across the network, enabling true horizontal scalability so that consumer-grade hardware nodes can participate securely without processing the entire blockchain.

The ledger team completed Plutus performance optimizations, while the Smart Contracts team secured funding to extend the "Blaster" verification tool into Aiken. For Leios, treasury funding was approved with 88% support, and a CIP-0164 update reduced certificate size by 40x. Additionally, candidate registration opened for the Constitutional Committee elections.

The consensus team added initial voting capabilities to the Leios prototype and retired the legacy V1 LedgerDB to simplify the API and clear the way for on-disk tables. In wallets, Lace launched on iOS, wrapping up its multi-platform rollout. Additionally, the Mithril team finalized recursive circuit refactoring and off-circuit verification tests for its SNARK prototype.

The Cardano Accelerator Program (CAP) is seeking specialized service providers for its Fall 2026 cohort, themed around Real-World Trust. Registered legal entities with a proven track record in areas such as go-to-market strategy, compliance, and fundraising can apply to deliver expert-led workshops for the participating startups. The application deadline is June 5, 2026.