Emre Yumlu 
Ethereum developers have finalized the timeline for the network’s next major hard fork, known as the Fusaka upgrade. Initially anticipated earlier this year, the update is now officially scheduled to launch on December 3, 2025. One of the most notable aspects is that increases to the network’s blob capacity will not take place immediately, but rather in a gradual rollout.
Gradual Expansion of Blob Capacity
The Fusaka upgrade will bring in 12 different Ethereum Improvement Proposals (EIPs) aimed at enhancing scalability, reducing transaction costs, and strengthening security.
However, the expansion of blob capacity will be rolled out in stages rather than all at once:
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December 17, 2025: First blob capacity increase
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January 7, 2026: Second blob capacity increase
Ethereum researcher Christine D. Kim confirmed that, following these two hard forks, blob capacity will expand to more than double its current level.
Why Fusaka Matters
Fusaka is designed to manage Ethereum’s transaction load more efficiently. A key feature of the upgrade is the use of blobs—large chunks of data that can be stored off-chain. This mechanism is expected to speed up layer-2 networks and reduce fees for users.
By improving how blockchain data is processed, Fusaka is set to make Ethereum far more scalable over the long term. This could result in lower costs for users and broader opportunities for developers.
Testnets and Security Measures
Before Fusaka is implemented on the mainnet, it will undergo three public testnet phases running from mid-October through mid-November.
In addition, the Ethereum Foundation has launched a four-week code audit program with $2 million in rewards allocated for identifying potential bugs.
Validator Exit Queue Hits Record Levels
Alongside preparations for Fusaka, the Ethereum network has experienced another significant milestone. Last week, more than 2.6 million ETH (around $12 billion) entered the validator exit queue, setting an all-time high.
The queue has stretched as long as 43 days, sparking debate within the community. While some argue for reducing the wait time, Ethereum co-founder Vitalik Buterin emphasized that longer queues are essential for safeguarding the network’s security.
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