Ethereum is about to take a key step in its evolution. After months of intensive development, Fusaka upgrade is now expected for December 3, 2025. This postponement reflects a desire to balance security, scalability and attractiveness. What impact for users and investors?
In short
- The Fusaka Ethereum upgrade is officially scheduled for December 3, 2025.
- Public tests will start in October on three test networks before the main deployment.
- The capacity of Blobs will gradually double with two additional hard forks in December and January.
- An audit program of $ 2 million was launched to secure the code before putting online.
Ethereum is further removing the Fusaka update
The main developers of Ethereum decided during the Consensus meeting (ACDC) #165. The Hard Fork Fusaka, initially scheduled for November, will finally see the day on December 3, 2025. This decision reflects the will of the teams to favor security and stability rather than yielding to time pressure.
Christine D. Kim, a recognized figure in Ethereum research, confirms that this upgrade will integrate twelve Ethereum improvement proposals (EIP). The objective is simple: radically transform the scalability of the network while preserving its decentralization.
The deployment calendar follows logical and secure progression. The tests will start on Holesky on October 1, will continue on Sepolia on October 14, then on Hoodi on October 28. This validation phase will identify and correct the latest vulnerabilities before launching on the main network.
The Ethereum Foundation has also launched a four -week audit program, with $ 2 million in awards. This initiative testifies to the strategic importance given to Fusaka and the determination to avoid any major technical incident.
Blobs at the heart of the technical revolution
Fusaka's most striking innovation lies in its revolutionary Blobs management. These data structures, introduced with the Dencun update, store large amounts of information outside the chain. Their optimization represents a crucial issue for the effectiveness of layer 2 networks.
The calendar is already fixed: two weeks after the launch of Fusaka, around December 17, the maximum capacity will go from 6 to 15 blobs per block. Then, a second hard fork scheduled for January 7, 2026 will bring this limit to 21 Blubs.
As the ETHEREUM ETHPANDAOPS“ 5 bpo are planned for Fusaka, which allows us to guarantee great scalability of the main network, safely ».
This progressive development responds to a tangible trend: since March 2023, the average use of blobs has increased from 0.9 to 5.1 per block, according to Dune data.
This rapid growth illustrates the urgency of a capacity rise to absorb growing demand, especially on the side of Rollups and other layer 2 solutions.
Hard Forks BPO has a major technical advantage: they do not require any update on the customer side. This simplicity facilitates deployment and minimizes the risks of network fragmentation.
The peer data availability sampling, another fusaka novelty, will allow validators to effectively check large data sets without downloading all of the information.
Careful preparation in the face of adoption challenges
Recent news However, highlights certain tensions in the Ethereum ecosystem. The validators' leaving queue has reached a record level with 2.6 million ETH awaiting withdrawal, or nearly $ 12 billion.
Is a figure that feeds questions: does it reflect a loss of confidence of certain actors or a simple natural rotation of the Staking? And above all, what potential impact on the course of the ETH?
Faced with these concerns, Vitalik Buterin, co -founder of Ethereum, wanted to reassure. According to him, the long queue of exit exists for a reason. Artificially reduce these deadlines would weaken the robustness of the protocol and make it “much less worthy of confidence”.
This position illustrates the permanent dilemma of Ethereum: offering more flexibility to participants while guaranteeing the structural security of the network.
Fusaka upgrade is part of a progressive roadmap. After Pectra in May 2025 – which had introduced the abstraction of the accounts and optimized the effectiveness of the validators -, Fusaka represents an intermediate step before the Hard Fork Glamsterdam, expected in 2026.
This next development should target a reduction in block times and the integration of the full EVM object format (EOF), further strengthening the performance of the ecosystem.
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