How Sei V2 Was Launched

Last updated 09/09/2025

Learn more about the technical details of Sei’s V2 upgrade here: https://blog.sei.io/sei-v2-the-first-parallelized-evm/

Sei V2 was an additive upgrade, bringing the first highly performant parallelized EVM into production. This upgrade required a Governance approval process to proceed.

The launch was divided into three phases.

Launch Countdown

By rolling out Sei v2 in measured steps, Sei Contributors were able to:

Minimize Risk: A gradual rollout allows for rigorous testing and monitoring of network stability, along with ensuring all third party infrastructure such as bridges and RPC nodes are ready for users to begin using Sei at scale.

Set Expectations: EVM projects and Infrastructure couldn’t start their Mainnet deployments until the upgrade was complete.

Optimize Performance: The phased approach enabled Sei Labs to measure and optimize network performance as more users and operators join the ecosystem. This ensures a stable and scalable network for everyone.

Phase 1: Governance

Sei is a permission-less, open source, delegated proof of stake network governed by SEI token holders.

Sei Labs engineers notified validators that v2, an update to the Sei blockchain, was ready to be adopted on Mainnet via an onchain proposal, beginning the Governance approval process.

This came after numerous audits and ongoing optimizations discovered during the Sei V2 public Devnet.

Phase 2: Alpha Launch: Stability and Third Party Infrastructure Deployment

When the Governance approval process was accepted, validators began to upgrade their software and the existing Sei Pacific-1 Mainnet was upgraded to “v2”.

At this stage, it became possible to deploy EVM based contracts, and began infrastructure integrations on Sei. Note: Existing applications and tokens still function exactly as they did before the upgrade.

Phase 3: v2 ready

In May 2024, Sei Labs officially announced that v2 was stable and critical infrastructure such as RPCs, bridges, indexers and multisigs were ready.

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Initially, a block gas limit will be in place for the purposes of stability. As time goes on and demand increases, this limit would be increased to satisfy demand.

Crucially, the work to continuously optimize Sei did not end here. The end goal is to build a blockchain that can support truly consumer-grade applications, serving millions of users. This upgrade was a major leap forward towards that goal.

Sei less, do more.