The scheduled implementation of the Glamsterdam network upgrade on the Hoodi testnet, which was slated to occur on October 26, 2026, has been officially postponed. This critical update, designed to refine Ethereum’s Layer 1 (L1) scaling capabilities and introduce significant architectural shifts, is now subject to a revised timeline. The decision, announced on October 22, 2026, includes the temporary suspension of a planned increase in the network’s gas limit to 200 million. As a result of this delay, all previously circulated activation instructions and scheduling tables for Hoodi are currently superseded, with developers and node operators advised to consult the latest guidance regarding the updated deployment schedule.
The Glamsterdam upgrade represents a landmark shift in how Ethereum handles transaction execution and block production. By integrating the Amsterdam execution layer changes with the Gloas consensus layer improvements, the network aims to optimize its throughput and security infrastructure. This delay in the testing phase, while disruptive to the short-term schedule, is standard practice in the rigorous, multi-staged rollout process that governs the Ethereum ecosystem.
Background and Context of the Glamsterdam Upgrade
Ethereum’s roadmap is defined by a series of planned, iterative upgrades that systematically address the "scalability trilemma"—the challenge of balancing decentralization, security, and scalability. The Glamsterdam upgrade focuses heavily on the efficiency of the L1 network. Its primary technical objectives center on Enshrined Proposer-Builder Separation (ePBS) and the introduction of Block-Level Access Lists (BALs).
Proposer-Builder Separation (PBS) has been a topic of intense discussion within the Ethereum research community for years. Currently, Ethereum relies on "mev-boost," a piece of middleware that allows validators to outsource the complex, high-stakes process of block building to specialized entities known as builders. EIP-7732, the centerpiece of the Glamsterdam upgrade, seeks to "enshrine" this process directly into the consensus protocol. By doing so, the network reduces its reliance on off-chain, trusted middleware, theoretically creating a more resilient and censorship-resistant block production environment.
Simultaneously, the introduction of Block-Level Access Lists (BALs) under EIP-7928 aims to optimize state access. By enforcing lists that record which accounts and storage slots are accessed during a block, the network can facilitate parallel transaction validation and more efficient state root computations. These improvements are critical for maintaining the sustainability of the network as the global state continues to grow, ensuring that node operators can keep up with the increasing computational demands of a global decentralized ledger.
A Chronology of the Testing Phase
The road to the current postponement began with the successful, albeit initial, deployment of the upgrade components. The following timeline outlines the development trajectory of the Glamsterdam initiative:
- September 17, 2026: Initial public announcement detailing the scope and technical specifications of the Glamsterdam network upgrade.
- October 6, 2026: Successful activation of the Glamsterdam upgrade on the Sepolia testnet. This served as the first major real-world stress test for the new consensus and execution rules.
- October 16, 2026: Formal publication of the Hoodi testnet activation schedule, which set the date for October 26, 2026, at epoch 132,352.
- October 22, 2026: Official notice of postponement issued by core developers, citing the need for additional review and coordination before proceeding on the Hoodi network.
The postponement of the Hoodi activation highlights the cautious approach taken by the Ethereum developer community. Before any upgrade touches the mainnet, it must pass through multiple "testnets"—experimental environments that mimic mainnet conditions. The delay on Hoodi ensures that any unforeseen bugs or friction points identified during the Sepolia deployment or subsequent internal audits can be resolved without putting the stability of the main network at risk.
Data-Driven Implications and Gas Repricing
One of the most consequential aspects of the Glamsterdam upgrade is the overhaul of gas accounting. The upgrade includes EIP-8037 and EIP-8038, which are designed to more accurately price the costs of state growth and state access. For years, Ethereum has operated under a gas model that occasionally subsidized state-heavy operations, leading to an bloated state size.
The increase of the gas limit to 200 million on the testnet is a bold attempt to provide more room for complex transactions and L2 batch data. However, this also carries risks for node operators, who must maintain the hardware capacity to handle these larger blocks. Data from the Sepolia testnet activation indicates that the new pricing model is robust, but it requires substantial adjustment from smart contract developers.
Applications that rely on hardcoded gas limits or assumptions about the cost of specific operations—such as certain decentralized finance (DeFi) protocols—may find their transaction logic broken under the new rules. The "Glamsterdam repricing impact guide" provided by the Ethereum Foundation is the definitive resource for developers to audit their codebases. The postponement provides these developers with a "second wind" to ensure their smart contracts are fully compatible with the new pricing mechanics.
Perspectives from the Developer Ecosystem
While official statements from core developers emphasize that the delay is a routine measure for quality assurance, the broader community has reacted with cautious patience. Within the developer community, the sentiment is largely supportive of the decision. In an environment where the security of billions of dollars in total value locked (TVL) is at stake, the consensus among stakeholders is that a delayed, secure upgrade is vastly preferable to an rushed, buggy one.
Client teams—the groups responsible for maintaining the software used by node operators (such as Geth, Nethermind, Prysm, and Lighthouse)—are currently working in sync to adjust their release schedules. The coordination required to synchronize these updates across thousands of independent nodes is significant. The postponement allows these teams to refine the "client releases," which must be updated by all node operators before the upgrade can be safely activated.
Broader Impact and Future Outlook
The Glamsterdam upgrade is not merely a collection of minor technical fixes; it is a structural evolution. By standardizing the interaction between builders and proposers, Ethereum is effectively hardening itself against the risks of centralization. The implications for the future of the network are profound.
As the network moves toward a future where it can handle significantly more transactions per second, the necessity of these upgrades becomes clear. Without the efficiencies promised by BALs and the improved security of ePBS, the network would eventually hit a bottleneck, either in throughput or in the ability for decentralized nodes to verify the chain.
The postponement also serves as a reminder of the unique governance model of Ethereum. Unlike centralized software development, where a single entity can push updates at will, Ethereum relies on the voluntary participation of node operators who must explicitly upgrade their software. This "opt-in" process acts as a final check and balance, ensuring that no change is forced upon the network without the consensus of the community.
Conclusion and Next Steps
As of late October 2026, the primary focus for the community remains the recalibration of the deployment timeline. The Ethereum Foundation has indicated that the mainnet activation date will only be set once the testnet deployments are deemed entirely stable and the client software has been thoroughly vetted.
For node operators, the immediate action is to monitor the official communication channels, such as the Ethereum blog and the relevant GitHub repositories, for the release of updated, compatible client versions. For users, the message is clear: there is no immediate action required. The network continues to function as normal, and the upcoming upgrade, whenever it is rescheduled, will be integrated in a manner that preserves the integrity and continuity of the Ethereum blockchain.
The transition to a more scalable, enshrined-PBS-based network is a marathon, not a sprint. The delay of the Hoodi activation is a testament to the rigor of the development process, prioritizing the long-term stability and security of the decentralized ecosystem above the convenience of an arbitrary calendar date. As the community moves toward the eventual activation of Glamsterdam, the focus will remain on rigorous testing, transparency, and collaborative development.
