Ethereum Fusaka Upgrade

Fusaka introduces upgrades across L1, L2, and execution that increase throughput headroom, stabilize gas rules, and improve blob economics. Learn what operators and L2 teams should expect during activation.

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December 3
8:00 PM UTC
YouTube Live

About the update

Fusaka delivers coordinated improvements across L1, L2, and execution, raising throughput headroom, refining gas behavior, improving blob economics, and making developer workflows more predictable.

Node operators, L2 teams, and engineers preparing for Fusaka testnet rehearsals and mainnet activation.

Speakers

Alexey Osipov
Core Developer,
Nethermind
Barnabas Busa
DevOps Engineer, Ethereum Foundation
Ben Adams
Principal Engineer,
Nethermind
Giulio Rebuffo
CTO,
Eragon
Lukasz Rozmej
Core Developer,
Nethermind
Marek Moraczyński
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Nethermind
Mario Vega
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Ethereum Foundation
Mark ???
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Lighthouse
Marius van der Wijden
Core Developer,
Geth
Parithosh Jayanthi
DevOps Engineer,
Ethereum Foundation
Potuz
Core Developer,
Prysm
Terence Tsao
Core Dev,
Offchain Labs
Tim Beiko
????,
Ethereum Foundation
Tomasz Stanczak
Co-ED, Ethereum Foundation
Toni Wahrstätter
Researcher,
Ethereum Foundation

Agenda

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Opening & Fusaka Overview

Moderator: Ahmad Bitar

‍Speakers: Barnabas Busa, Mario Vega

Description: Overview of Fusaka’s role in scaling Ethereum. How the upgrade aligns L1, L2, and execution changes to reduce gas volatility, improve economics, and support smoother testnet rehearsals.

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Testing & Fork Readiness: How We Got Here

Moderator: Kamil Chodola

‍Speakers: Barnabas Busa, Mario Vega

Description: Status of devnets, rehearsal performance, final-stage fixes, and why coordination across client teams results in a more predictable activation path.

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Scaling the L1

Moderator: Ben Adams

‍Speakers: Toni Wahrstätter, Giulio Belloufo, Lukasz Rozmej, Tim Beiko, Marius van der Wijden

Description (EIPs 7623, 7823, 7838, 7934, 7935): Updates address tight gas accounting, right-size cryptography costs, and adjust block and gas limits. Together, they raise throughput headroom and strengthen the base layer for future scaling.

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Scaling the L2

Moderator: Ahmad Bitar

‍Speakers: Terence Tsao, Potuz, Mark, Alexey Osipov

Description (EIPs 7584, 7892, 7918): Changes expand blob capacity, refine blob-fee behavior, and stabilize cross-layer economics. Rollups gain more predictable conditions and improved capacity without added coordination risk.

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End User Experience and Developer Impact

Moderator: Ahmad Bitar

‍Speakers: Ben Adams (for 7917), plus group commentary from the panel

Description (EIPs 7917, 7939, 7951): Improvements make confirmations more predictable, simplify contract logic under the updated gas rules, and support smoother wallet interactions. The upgrade makes building and operating on Ethereum more consistent.

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Live Fusaka Fork

Moderator: Ben Adams

‍Speakers: Tomasz Stanczak, Ben Adams

Description: Walkthrough of the activation. What node operators will observe, how clients behave during the fork, and expectations for stability across implementations.

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Closing & Call to Action

Moderator: Ahmad Bitar

Description: A brief wrap-up highlighting key takeaways from Fusaka and directing operators to upgrade notes, testing guidance, and feedback channels.

Lean more about Fusaka

For a deeper look at the engineering work behind the upgrade, see Shaping Fusaka: Nethermind’s 6 EIPs for Ethereum’s Next Upgrade.

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