The Ethereum Foundation is sounding the alarm ahead of its next major upgrade. Glamsterdam, which introduces a new gas calculation model, could render certain existing tools incompatible — and developers are being urged to act now.
The message is clear: test early on the Plataberget testnet before the upgrade rolls out to other test environments and, ultimately, the Ethereum mainnet. A precaution that speaks volumes about the scale of the changes ahead.
Behind this technical warning lies a significant challenge for the Ethereum ecosystem: ensuring a smooth transition to a deeply overhauled gas model without disrupting the DeFi protocols, wallets, and infrastructure tools that keep the network running day to day.
Glamsterdam: What Really Changes With the New Gas Model
Glamsterdam is the next major Ethereum upgrade, expected to follow Pectra. Its most structural change concerns the gas model — that is, the way the network calculates and charges for the cost of executing transactions and smart contracts. This deep-level overhaul aims to make Ethereum more efficient and more predictable for both users and developers.
The problem is that many tools — indexers, transaction simulators, development frameworks, and wallet interfaces — rely on precise assumptions about how gas currently behaves. A change to the underlying model can be enough to make these tools malfunction, or even trigger silent errors that are difficult to catch in production. The Ethereum Foundation has therefore deemed it necessary to alert the ecosystem well in advance.
The Plataberget testnet has been set up specifically to allow teams to test their tools’ compatibility with Glamsterdam before the upgrade propagates to other testnets such as Sepolia or Holesky, and then to mainnet. This is a critical testing window that developers simply cannot afford to ignore.
Why This Warning Is a Strong Signal for the Ethereum Ecosystem
The Ethereum Foundation does not often communicate this directly about compatibility risks. This proactive statement signals that the changes introduced by Glamsterdam are significant enough to warrant heightened vigilance. In the Ethereum ecosystem, where billions of dollars in value flow daily through DeFi protocols, bridges, and on-chain applications, an undetected incompatibility can have serious consequences.
The teams most exposed are those maintaining infrastructure tools: client nodes, RPC providers, simulation tools such as Tenderly or Foundry, and testing frameworks. These actors will need to update their code to reflect the new gas logic before mainnet deployment. DeFi protocols that rely on gas estimations to optimize their execution strategies are also firmly in the spotlight.
This situation echoes previous upgrades such as EIP-1559 and the transition to Proof of Stake (The Merge), both of which required significant adaptations from developers. The difference this time: the warning is coming early, giving the ecosystem time to adjust without rushing. A sign of growing maturity in Ethereum’s technical governance.
What Developers Should Do Right Now
The Ethereum Foundation‘s recommendation is unambiguous: deploy and test on Plataberget immediately. This testnet, dedicated to Glamsterdam, is the only environment that accurately reflects the new gas model. Waiting for the next general-purpose testnets means risking the discovery of incompatibilities too late in the deployment cycle.
Developers are advised to prioritize checking:
- Hardcoded gas estimates in their smart contracts or interfaces
- Deployment scripts that depend on current gas behavior
- Simulation and testing tools that model transaction execution
- RPC integrations that expose gas-related data to third-party applications
The Glamsterdam upgrade does not yet have a confirmed mainnet deployment date, but the Ethereum roadmap has been accelerating since Pectra. Teams that prepare now will avoid the last-minute scrambles that have sometimes accompanied previous network upgrades. The Ethereum ecosystem has been warned — the ball is now in its court.
