From Merge to Mega Upgrade: Buterin Outlines Ethereum’s Next Big Transformation

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An updated roadmap outlines Ethereum’s plan for a sweeping, multi-year overhaul that would rework nearly every core layer of the protocol, with quantum security and privacy now elevated to the top of the agenda. The update comes as ether has climbed more than 12% over the past week.

Ethereum co-founder Vitalik Buterin shared fresh insights into “Lean Ethereum,” a long-term initiative to rebuild the network following recent research meetings.

He described the effort as Ethereum’s third major evolution, after the 2022 The Merge, which transitioned the network from mining to staking. The plan targets a three- to four-year timeline to replace most major protocol components, while aiming to minimize disruption to existing applications.

First introduced in July 2025, Lean Ethereum serves as a technical blueprint for the network’s next decade, centered on deploying more advanced cryptographic systems than those currently in use.

Buterin’s latest update, accompanied by a revised internal “strawmap,” provides greater clarity on shifting priorities and execution.

Quantum resistance has moved sharply up the priority list. While the threat remains years away, widely held assumptions suggest sufficiently advanced quantum computers could eventually break today’s cryptographic standards. Ethereum is now prioritizing a transition to quantum-safe alternatives across all vulnerable components, including redesigning low-cost data storage used by rollups.

Privacy has also been elevated to a core design objective. The plan calls for infrastructure that enables private, intermediary-free transactions by default, rather than treating privacy as an optional feature.

Another major shift involves how the network verifies transactions. Instead of requiring every node to re-execute all activity, Ethereum plans to adopt recursive STARKs, a cryptographic proof system that allows nodes to validate compact proofs rather than repeating computations. This approach is expected to improve efficiency and reduce the cost of running a node.

The most disruptive proposed change centers on Ethereum’s “state,” the full record of account balances and smart contract data at any given time.

Each transaction updates this state, and every node must currently store and maintain it. As the network grows, this expanding data burden raises costs and creates pressure toward centralization.

To address this, Lean Ethereum proposes limiting the growth of the current flexible “dynamic” state while introducing new, more scalable state models that are significantly cheaper to maintain. This approach could expand total data capacity from roughly 2 terabytes today to more than 100 terabytes by 2030, without requiring every node to store everything in the traditional way.

The roadmap also signals a potential shift beyond the Ethereum Virtual Machine, which currently powers smart contracts. One leading candidate is the open architecture RISC-V. Buterin suggested the EVM could remain as a higher-level interface, while the protocol itself transitions to a simpler execution base over time.

Across the plan, Ethereum is expected to steadily scale capacity, with higher throughput, increased data limits, and shorter block times over the coming years.

Buterin pointed to a major capacity boost in the upcoming Glamsterdam upgrade and indicated that the following Hegotá upgrade could be the final major fork before the Lean Ethereum phase fully begins.

Overall, the roadmap represents a long-term strategic shift, committing Ethereum to quantum security and privacy well ahead of broader industry urgency. The update comes as ether trades near $1,777, marking one of the strongest weekly performances among major cryptocurrencies.