Ethereum Sepolia Testnet Boosts Gas Limit to 200 Million

Ethereum’s Sepolia testnet has activated the Glamsterdam upgrade, marking a significant milestone in the network’s development. The upgrade went live on October 6, 2026, at 13:53:36 UTC, coinciding with epoch 353,024. This upgrade introduces an optional gas limit increase to 200 million, a substantial rise from the previous cap of around 60 million.

The Glamsterdam upgrade combines two tracks: Amsterdam for the execution layer, handling transactions and smart contracts, and Gloas for the consensus layer, where validators confirm block validity. The standout feature is the enshrined proposer-builder separation (ePBS), defined in EIP-7732. This separation now resides within the protocol itself, enhancing block production efficiency. The upgrade also includes block-level access lists and gas repricing adjustments to better align fees with computational demands.

The gas limit increase to 200 million is optional for validators, allowing them to test the new capacity without immediate mainnet implications. While mainnet activation and final gas limit parameters remain undecided, the upgrade provides valuable insights into network performance under heavier blocks. Developers have thoroughly tested the upgrade in earlier environments, including Platåberget and Devnet 8, ensuring stability before its deployment on Sepolia.

The potential impact of larger blocks on node operators raises concerns about decentralization, as increased computational demands could challenge smaller operators. The opt-in structure on Sepolia helps developers observe validator behavior and node performance, informing future mainnet decisions. The final mainnet gas limit remains uncertain, with Sepolia’s 200 million figure serving as a test target rather than a definitive benchmark.