Cardano Node 11.0.1 Moves Mainnet Readiness Toward Van Rossem Upgrade

Cardano infrastructure teams are continuing preparations for Van Rossem, the Protocol Version 11 hard fork named in memory of Max van Rossem. The update now centers on node adoption, tooling compatibility and the final governance path required before any mainnet enactment can take place.

cardano-node 11.0.1 Supports the PV11 Hard Fork Path

cardano-node 11.0.1 was released on May 5, 2026 as the first node version to support the PV11 intra-era hard fork. The release enables Cardano infrastructure to move toward Protocol Version 11 once the required hard fork governance action is submitted, voted on by SPOs, DReps and the Constitutional Committee, and enacted on-chain.

The release also moves cardano-api and cardano-cli into the 11.0 series, advances the experimental hard fork target toward Protocol Version 12 and adds HTTPS support for EKG and Prometheus metric servers in cardano-tracer. It also introduces new Linux dependencies connected with LSM capabilities, including liburing, protobuf-compiler and snappy-c.

Intersect previously stated that node v11.0.1 remains the mandatory upgrade path for infrastructure providers to transition through the Protocol Version 11 hard fork boundary. Operators that remain on older node versions, including node 10.7.1, are not positioned to progress beyond that boundary once the mainnet hard fork is enacted.

Van Rossem Advances After PreProd Enactment

Van Rossem is the name used for Cardano’s Protocol Version 11 hard fork. Intersect reported that the Van Rossem hard fork was successfully enacted on PreProd on June 10, moving the process from testnet activation into ecosystem readiness and mainnet planning.

The next step remains tied to governance. Intersect said the Hard Fork Working Group’s mainnet go/no-go decision was scheduled for June 15, while Technical Steering Committee and Civics Committee reviews supported submission readiness. As of June 16, no public official source has confirmed the go/no-go result, a mainnet governance action ID or a confirmed mainnet enactment date.

That distinction keeps the current story in the readiness phase. cardano-node 11.0.1 prepares infrastructure for PV11, but the node release itself is not the same event as mainnet enactment. Van Rossem is also separate from Ouroboros Leios, which belongs to Cardano’s scaling roadmap, and from the Plutus Cost Model parameter update, which is a separate governance parameter action.

Mainnet Readiness Depends on Node Adoption and Tooling Compatibility

Intersect’s June 12 update reported increasing adoption of node v11.0.1 across the Cardano ecosystem. According to the update, PoolTool showed 52 percent of nodes self-reporting v11, while 76 percent of block production in the current mainnet epoch was occurring on Protocol Version 11. Cexplorer reported that more than 84 percent of blocks produced over the previous five days were created by v11 nodes.

The readiness path also includes supporting infrastructure. Intersect has identified DB-Sync v13.7.1.0 as the recommended version for ecosystem participants preparing for Van Rossem, while Ogmios v6.14.0.2 and Kupo v2.11.0.1 remain supported options through Intersect-maintained forks as upstream-compatible releases are pursued.

For SPOs, exchanges, wallets, dApp teams and indexer operators, the current phase is an operational compatibility window. Testing on Preview and PreProd remains focused on transaction construction, script validation, indexer behavior, wallet support and toolchain readiness. Until a mainnet governance action is publicly submitted and an enactment date is confirmed, Van Rossem remains a mainnet readiness story built around node adoption, infrastructure checks and the final governance path to Protocol Version 11.