Ethereum and Solana Major Upgrades Set for October 2026
Ethereum and Solana are both undergoing major protocol upgrades in October 2026, with the former activating Glamsterdam on the Sepolia testnet on October 6 and the latter launching Alpenglow on its testnet earlier in the month. Glamsterdam, Ethereum’s next hard fork, combines two layer upgrades: Amsterdam for execution and Gloas for consensus. It includes ten Ethereum Improvement Proposals (EIPs), with EIP-7732 introducing an enshrined proposer-builder separation to improve block construction accountability and EIP-7928 enabling higher gas limits through execution optimizations.
Solana’s Alpenglow is its largest protocol change since launch, replacing the existing TowerBFT consensus mechanism with a two-component system called Votor and Rotor. Votor eliminates up to 75% of block space used by vote transactions, freeing capacity for user transactions and reducing finality time from 12.8 seconds to 100-150 milliseconds. Rotor, the second phase, aims to improve block data propagation but lacks a confirmed activation date.
The upgrades differ significantly in approach. Ethereum’s changes focus on enhancing scalability and efficiency within its existing framework, while Solana’s Alpenglow targets consensus and block propagation to dramatically reduce finality time. Both upgrades highlight the ongoing evolution of blockchain technology, with each network addressing its unique challenges to improve performance and reliability.