News · Ethereum & L2s
The testnet hard fork brings enshrined proposer-builder separation, block-level access lists, and a scheduled 200M gas limit at epoch 353,024.
Key point 1 of 3
01
Glamsterdam activates on the Sepolia testnet at epoch 353,024 on October 6, 2026, at 13:53:36 UTC .
Key point 2 of 3
02
The fork introduces enshrined proposer-builder separation (EIP-7732) and block-level access lists (EIP-7928) .
Key point 3 of 3
03
Sepolia schedules a 200M block gas limit, though Prysm and Teku clients default to 60M without manual flags , .
Context
Glamsterdam represents the subsequent major milestone following Fusaka, integrating Amsterdam and Gloas to restructure Ethereum block construction and state expansion mechanics .
Why it matters
Sepolia testnet operators, validator clients, and application developers with fixed gas stipend contracts must adjust parameters ahead of epoch 353,024 .
What to watch
Client release coordination and scheduling dates for the Hoodi testnet and Ethereum mainnet .
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