Major blockchain upgrades set for 2026

Ethereum, Solana and Avalanche are planning major protocol upgrades for 2026. Coinbase’s Base launched the Beryl hard fork last Friday. Bitcoin development remains stalled as developers debate covenant opcodes and post‑quantum migration plans.

Ethereum’s Glamsterdam upgrade is scheduled for mainnet in the second half of 2026 and is under testing on developer networks. The upgrade aims to increase throughput, reduce database bloat and strengthen layer‑1 performance to support higher data capacity for use cases such as stablecoin settlement and tokenized real‑world assets. A key change is enshrined proposer‑builder separation, or ePBS, which moves block building and proposing functions into protocol rules to change how transaction ordering is controlled. Holly Atkinson, chief product and technology officer at 1inch, noted ePBS targets concentrated control over ordering but cautioned it will not eliminate all forms of maximal extractable value and transaction‑ordering attacks.

Solana’s Alpenglow is a consensus overhaul approved by governance in September 2025 and expected to ship with the Agave 4.1 validator client release later in 2026. Alpenglow replaces parts of the existing TowerBFT system with a new voting component called Votor. The upgrade removes on‑chain vote transactions and targets much faster finality — roughly 100–150 milliseconds in optimal conditions versus about 12.8 seconds today. Arun Krishnakumar of enterprise software firm R3 said Alpenglow will support efforts to position Solana for capital markets. Hadley Stern, board director at DeFi Development Corp, commented that removing on‑chain votes should clarify validator economics and provide more reliable telemetry for institutional users.

Base activated the Beryl hard fork last Friday after a roughly two‑hour block production halt caused by an invalid block and a temporary consensus failure. Jesse Pollak, Base co‑founder, wrote that user funds were unaffected and added that “a halt is not okay,” and that lessons from the incident will be used to strengthen the platform. Beryl introduces a B20 native token standard, shortens withdrawal finality from seven days to five, and integrates Reth V2 to reduce node storage needs and improve execution efficiency. Tim Sun, a senior researcher at HashKey Group, noted Base’s unified technology stack should allow faster software iterations, while liquidity patterns that once moved across a broader Superchain may concentrate on Base.

Avalanche’s development is focused on making its platform more attractive to institutions and tokenized asset issuers. The Etna changes enabled sovereign Avalanche L1s and reduced the cost of launching dedicated blockchains by more than 99 percent. One firm migrated more than $2 billion in tokenized securities to a dedicated Avalanche L1. Avalanche is also working on Streaming Asynchronous Execution, which separates transaction execution from consensus to increase throughput and keep fees steadier during heavy use. The Avalanche Payments Collective counts firms such as Franklin Templeton, VanEck and WisdomTree among its backers.

Bitcoin’s work in 2026 centers on debates rather than scheduled upgrades. Developers continue to discuss covenant proposals including OP_CAT and CheckTemplateVerify (CTV), Lightning Network improvements such as LNHANCE, and post‑quantum migration ideas like BIP‑360. No major soft fork has been activated since Taproot in 2020, and there is no agreed path to activation for covenant opcodes this year. Authors of BIP‑360 estimate a full migration to quantum‑resistant addresses and signatures would take years under optimistic assumptions, making a quantum‑resistance upgrade unlikely before the end of 2026.

Observers note that technical risks, governance debates and deployment challenges will affect how quickly institutions adopt on‑chain settlement and tokenized asset models.