Ethereum Launches Platåberget Testnet to Vet 'Glamsterdam' Upgrade

The Ethereum Foundation has launched the Platåberget testnet to allow developers to stress-test the upcoming Glamsterdam upgrade. This move marks a critical transition toward mainnet deployment for a coordinated update affecting both the network's consensus and execution layers.

Launched on August 17, 2026, with a scheduled fork for August 20, the Platåberget testnet serves as a public staging ground for the Glamsterdam upgrade—a combination of the Gloas and Amsterdam updates. The upgrade introduces several high-impact technical changes, including Enshrined Proposer-Builder Separation (ePBS), Block-Level Access Lists (BALs), and significant gas repricings. Specifically, the network is increasing the maximum deployed contract size from 24KiB to 64KiB and raising the maximum initcode size from 48KiB to 128KiB.

A Shift in Gas Dynamics

Central to the upgrade is a fundamental change to how the network calculates costs. The Ethereum Foundation is implementing gas repricings aimed at a ~200M gas floor and introducing a separate state gas dimension via EIP-8037. This new dimension specifically targets operations that create new state on the blockchain.

This shift means that basic operations, such as transferring ETH to a new account, will no longer carry a flat cost of 21,000 gas. By decoupling state creation from standard execution gas, the network aims to more accurately price the long-term storage burden placed on nodes. This ensures that the cost of adding data to the chain reflects the actual resource consumption of the network's validators.

Ecosystem Risks

The Foundation has issued a stark warning to the developer community regarding these changes. Because the gas model is shifting, any tool that relies on a hardcapped maximum gas limit—including wallets, indexers, and gas estimators—will break and must be updated.

If these tools are not adjusted to account for the new state gas dimension, users may experience inaccurate gas estimations or failed transactions. The risk extends across nearly every user-facing interface in the Ethereum ecosystem, making the current testing phase a prerequisite for a stable mainnet launch. Developers must audit their gas-handling logic to ensure compatibility with the dual-gas system.

The Path to Mainnet

Platåberget is the first in a series of public tests. Following this phase, the Glamsterdam features will progress to longer-lived testnets, including Sepolia and Hoodi, before the final rollout to the mainnet. Developers are urged to use the current testnet to identify and resolve tooling incompatibilities immediately to avoid widespread disruption upon the upgrade's final deployment. This phased approach allows the community to iron out bugs in a controlled environment before the changes affect live assets.