In a significant development for the Ethereum developer ecosystem, the core development team has officially announced the postponement of the "Glamsterdam" network upgrade on the Hoodi testnet. Originally slated for activation on October 26, 2026, at 17:42:48 UTC (epoch 132,352), the upgrade has been put on hold to allow for deeper technical scrutiny. This decision, finalized during the 248th All Core Developers Execution (ACDE) call, marks a cautious pivot in the development lifecycle of the protocol, prioritizing network stability and security over predetermined scheduling.
Main Facts: What Has Changed?
The Glamsterdam upgrade was designed as a pivotal milestone for the Hoodi testnet, encompassing several high-impact changes, including the Amsterdam execution layer activation, the Gloas consensus layer activation, and a planned increase in the network’s gas limit to 200 million. By delaying this activation, the core development team has effectively removed these parameters from the current configuration.
It is important to note that this is not a reversion of the Hoodi chain history. The network remains functional and operational; rather, the configuration settings that would have triggered the hard fork at the specified epoch have been rolled back. As of this writing, there is no new activation date or epoch assigned to the Glamsterdam upgrade. The developers have indicated that a new schedule will be determined only after a thorough investigation into the integration of EIP-8037—a proposal that has raised questions regarding its interaction with existing mainnet smart contracts.
Chronology of the Decision
The path to this postponement began with a rigorous evaluation of the proposed changes within the ACDE #248 meeting. The following timeline outlines the transition from anticipation to the current state of caution:
- Initial Announcement (October 16, 2026): The community was provided with a comprehensive roadmap for the Glamsterdam upgrade on the Hoodi testnet, establishing October 26 as the target activation date.
- The ACDE #248 Deliberations: During the 248th Core Developers call, technical leads identified potential risks associated with EIP-8037. The consensus among the developers was that the interaction between this proposal and production-level smart contracts required more empirical data than was currently available.
- Postponement Announcement: Following the meeting, the development team updated the project’s documentation, superseding the original announcement and notifying node operators and validators to halt preparations for the October 26 upgrade.
- Current State: The network is in a holding pattern. The development team is actively monitoring the research findings on EIP-8037, and the community is awaiting further guidance on a revised timeline.
Technical Implications: Why EIP-8037 Matters
At the heart of the postponement is EIP-8037. In complex, decentralized systems like Ethereum-based testnets, the introduction of a new Improvement Proposal (EIP) is never a trivial matter. EIP-8037, which proposes significant changes to how the network handles execution, has the potential to fundamentally alter the behavior of smart contracts.
The primary concern among core developers is "backwards compatibility" and the potential for unintended side effects. When a protocol upgrade is implemented, it is immutable once the epoch is reached. If an EIP causes a conflict with established contract patterns, it could lead to gas price spikes, transaction failures, or even vulnerabilities that bad actors could exploit. By delaying the Glamsterdam upgrade, the developers are exercising the "safety-first" philosophy that has defined Ethereum’s growth for years. They are essentially opting for a "measure twice, cut once" approach, ensuring that the integration of EIP-8037 does not break the underlying utility of the Hoodi testnet.
Official Responses and Developer Guidance
The impact of this delay falls squarely on node and validator operators. The core developers have issued clear, urgent directives to the community to prevent any disruption to the network’s health.
Instructions for Node and Validator Operators
If you are currently running a Hoodi node or validator, you must treat the previous instructions as obsolete. It is critical that operators do not rely on older software versions or configurations that still contain the October 26 activation logic. The risk of running an outdated configuration is that a node might attempt to fork onto a chain that is no longer intended to exist, leading to a loss of sync or potential slashing penalties if not properly managed.
Operators should:
- Monitor Official Client Release Notes: Do not assume that current client versions are "upgrade-ready." Always verify that the release notes explicitly state the removal of the October 26 Glamsterdam activation.
- Verify Client Configurations: Check both execution and consensus layer clients to ensure that the hard-coded activation epoch has been adjusted or disabled.
- Stay Informed: Follow the official channels, including the Ethereum Foundation’s GitHub repositories and the ACDE meeting summaries, to receive the latest updates on the replacement schedule.
Client-Specific Updates
The development team has begun the process of vetting new releases. As of now, the Lodestar consensus layer client has moved to v1.50.1 to address these changes. Other clients, including Grandine, Lighthouse, Nimbus, Prysm, and Teku, are expected to release updated versions shortly. Validator operators must ensure that both their Beacon Node and their Validator Client are updated in tandem to maintain network participation.
Implications for the Ecosystem
The delay of the Glamsterdam upgrade carries broader implications for the blockchain ecosystem. While a postponement might appear to be a setback, it is, in reality, a testament to the decentralized governance model’s resilience.
For Application Developers
For developers building on the Hoodi testnet, the message is clear: do not build your testing cycles around an October 26 upgrade. Any application logic that was being developed to leverage the features included in Glamsterdam should be kept in a staging environment. The absence of a new date means developers should focus on the current stable version of the testnet, avoiding the temptation to implement features that are not yet production-ready.
For the Broader Ethereum Community
It is critical to emphasize that this announcement is specific to the Hoodi testnet. It does not set a mainnet activation date, nor does it impact the Ethereum mainnet in any way. Ethereum users and ETH holders do not need to take any action. The distinction between testnet and mainnet is essential here; the Hoodi testnet exists specifically to identify these types of risks before they reach the main network, where the stakes are significantly higher.
Future Outlook: A Measured Path Forward
As the dust settles on the decision to postpone the Glamsterdam upgrade, the focus has shifted toward re-evaluation. The core developers are tasked with three primary objectives:
- Deep Dive into EIP-8037: Researchers are conducting simulations to observe how the proposal interacts with various contract types and complex bytecode.
- Community Feedback: The developers are maintaining an open dialogue via the ACDE process, inviting the wider community to weigh in on the implications of the proposed changes.
- Establishing a New Timeline: Once the technical risks are mitigated, a new activation epoch will be selected. This will likely be communicated well in advance, following the same transparent process that led to the original, albeit cancelled, October 26 date.
In conclusion, the decision to delay the Glamsterdam upgrade is a proactive measure that highlights the maturity of the Ethereum development process. By acknowledging the technical uncertainties early and choosing to delay rather than rush into an uncertain activation, the community is safeguarding the integrity of the network. For those involved in the Hoodi testnet, the directive remains consistent: stay vigilant, keep your clients updated, and await further instructions from the core development team as the path toward the Glamsterdam upgrade is cleared of obstacles.
