Uniswap v4 Codebase Opens for Development
The Uniswap Foundation announced on June 14, 2026, that the core code for Uniswap v4 is now unfrozen. The milestone moves the project from planning to active development. Developers can now start building and testing new features for the next major upgrade to the decentralized exchange (DEX).
The Uniswap Foundation made the announcement on the official Uniswap governance forum. A DEX is an exchange that operates without a central authority.
"Today we're unfreezing the v4 core codebase," the post stated. "This means developers can start creating new features for v4."
Launch Depends on Ethereum Dencun Hard Fork
The team clarified that the v4 code will not launch on the Ethereum mainnet until after the Dencun network upgrade is complete. The Dencun hard fork is a planned upgrade to the Ethereum blockchain. It is expected to lower transaction costs for Layer 2 networks built on Ethereum.
The Uniswap Foundation said developers should use this time to test their new hooks. Hooks are a new feature in v4 that let developers add custom logic to liquidity pools.
Development Moves to Public Testing Phase
Unfreezing the codebase means the core rules are now set. Developers can start working on top of that foundation. The code will be tested in public development networks, or devnets, before any mainnet launch.
The team stated the goal is to have a "secure, tested, and community-reviewed" version of v4 ready. It will launch only after the Dencun upgrade is activated on Ethereum.
Why This Matters
Uniswap is a leading decentralized exchange on Ethereum. Its v4 upgrade is a major planned change to its core technology. Unfreezing the code is a formal step toward a live release. It gives developers a stable foundation to build new tools. The upgrade's reliance on the Dencun hard fork shows how major DeFi projects are tied to Ethereum's broader development roadmap. This step signals progress but does not guarantee an immediate launch date.
