Ethereum validators face a configuration choice next week that could determine how aggressively the network tests its next major scaling push.

The Glamsterdam upgrade is scheduled to activate on the Sepolia testnet on Oct. 6 at 13:53:36 UTC, bringing changes designed to increase Ethereum's execution capacity. Node operators must update both execution and consensus clients before the fork, while stakers must also upgrade their beacon node and validator software.

But simply installing compatible software will not necessarily move Sepolia toward the 200 million gas preference scheduled for the test.

Prysm 7.2.0 and Teku 26.9.1 both support Glamsterdam but will continue using a 60 million gas preference after activation unless validators explicitly change their settings, according to the Ethereum Foundation. Prysm operators must use version 2 proposer settings or the keymanager API, while Teku validators can override the default through their validator configuration.

The distinction turns Sepolia into a coordination test for Ethereum's effort to substantially expand Layer 1 capacity.

A higher block gas limit allows more aggregate computation to fit into each block, creating room for more transactions and high-demand applications such as decentralized exchanges and other DeFi protocols. Additional capacity can ease congestion and reduce pressure on transaction fees when demand rises, though it does not make Ethereum's underlying block times faster.

Ethereum has already been moving in that direction. Its block gas limit began rising from 30 million toward 36 million in February 2025, the first adjustment since the network moved to proof-of-stake. It subsequently climbed to 45 million before Fusaka client releases adopted 60 million as their default.

Glamsterdam would push that scaling experiment considerably further, but 200 million should not be interpreted as an automatic new gas limit.