Cardano completes first fully community-ratified hard fork
Regulation & Gov ·
The Van Rossem upgrade went live on July 18, moving the network to protocol version 11 without any downtime and without direction from Input Output, the blockchain's founding development company.
According to Decrypt, the update is the first major Cardano protocol change approved solely through on-chain governance rather than by centralized company decision. Three separate groups had to sign off: delegated representatives, or DReps, voted in favor at 77.63%, above the 60% threshold required; stake pool operators approved at 52.7%, narrowly clearing the 51% minimum; and a seven-member Constitutional Committee confirmed the proposal met the network's founding rules. This layered approval process traces back to the Chang hard fork in 2024, which introduced on-chain voting, and the Plomin hard fork in early 2025, which extended real decision-making authority to token holders.
The upgrade is named for Max van Rossem, a Dutch contributor to Cardano who died in October 2025 and who worked as a developer, elected representative, node operator, and constitutional delegate helping to build the governance framework that just carried this fork into effect.
On the technical side, Van Rossem is described as an intra-era upgrade, meaning it refines existing systems rather than overhauling Cardano's base architecture. Its central aim is cutting execution costs for Plutus, the smart contract language underlying DeFi applications, NFT platforms, and on-chain payment tools on the network. Lower costs are intended to let developers run more complex applications more cheaply. The update also bundles five technical changes, including faster cryptographic signature verification tools and a security fix mandating that every stake pool operate with a unique cryptographic key, closing a previously known vulnerability.
A separate summary circulating in the same cluster, cited via a post on X, corroborates the core details: the Van Rossem fork was activated through on-chain governance and adds Plutus capabilities alongside cost-model adjustments aimed at reducing smart-contract execution expenses.
For ordinary users, nothing changes immediately, and the practical effects will depend on how quickly developers adopt the lowered execution costs and new cryptographic tools. What remains to be seen is whether this governance model — spanning DReps, stake pool operators, and the Constitutional Committee — becomes the standard path for future Cardano upgrades, and how builders respond now that Protocol Version 11's features, including constant-time array indexing and cross-version support for Plutus V1, V2, and V3, are live on mainnet.