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Vitalik Buterin Unveils Lean Ethereum: Network’s Largest Upgrade Since the MergeEthereum co-founder Vitalik Buterin has outlined a refreshed long-term vision for the blockchain, describing it as the most extensive restructuring since the network abandoned mining, and stating that Ethereum is “reinventing itself.”
In a tweet on Saturday, Buterin shared insights from a recent Berlin meeting of Ethereum researchers, together with an updated draft roadmap published at strawmap.org. He characterized “Lean Ethereum,” initially proposed in 2025, as the protocol’s third major evolution, comparable to the 2022 Merge that transitioned Ethereum to proof-of-stake. Nearly all core components will be replaced over three to four years, he noted, without requiring existing applications to migrate.
Two weeks ago, Ethereum researchers met in Berlin to continue charting the protocol’s long-term trajectory, following along discussions with client teams in Svalbard in April.
The updated strawmap is at and I attached a picture of it to this post.
My… pic.twitter.com/KPGayHSySf
— vitalik.eth (@VitalikButerin) July 4, 2026
State change
The central element is a shift in how the network validates itself. Rather than having every node re-execute each transaction, Ethereum would verify a compact cryptographic proof of the chain using recursive STARKs, a zero-knowledge proof technique that Buterin aims to embed as a foundational protocol feature.
He also proposed a simplified consensus model with one or two-round finality, multidimensional gas pricing, and eventually a move beyond the EVM toward an instruction set such as RISC-V.
Quantum safety, privacy and data storage
Preparing for potential quantum computing threats has become a higher priority, Buterin said, with all cryptography exposed to such risks set to be replaced by quantum-resistant alternatives, and progress on quantum-safe “blobs” already underway for months.
Privacy, he explained, is now treated as a first-class objective rather than an add-on, integrated into areas such as the mempool and state tree, with the entire initiative relying on formal verification.
The most significant disruption involves data storage. Buterin described a 2030 network retaining about 2TB of current flexible “dynamic” state alongside 100TB of a new, more scalable but constrained type, well suited to tokens, NFTs, and much of DeFi, though less ideal for complex contracts like decentralized exchanges. Migrating an ERC-20 token to the new storage would be optional, he said, but could reduce its fees by more than tenfold.
None of these changes will occur simultaneously. Buterin indicated the upcoming Hegotá fork will likely be Ethereum’s final upgrade before the “Lean” phase starts, with a substantial gas-limit increase expected at the nearer-term Glamsterdam upgrade and further improvements in capacity and speed over roughly five years.
The proposal arrives as the Ethereum Foundation itself streamlines operations, having recently reduced staff and tightened its budget, while earlier Ethereum upgrades experienced repeated delays before deployment.
