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GMX disables v2.2b contracts, urges integrators to migrate to v2.2c before September 14 deadline
The decentralized perpetual futures protocol is deprecating older smart contracts across Arbitrum, Avalanche, and MegaETH, giving integrators a firm cutoff date to update their systems.
GMX is pulling the plug on its v2.2b synthetics contracts on September 14, 2026, completing a migration cycle that began with an earlier deprecation timeline announced on August 17. Anyone building on top of GMX’s infrastructure, whether through direct contract calls or third-party integrations, needs to move to v2.2c or risk their systems going dark.
The newer contracts are already live on Arbitrum, Avalanche, and MegaETH. For regular users interacting through the official GMX interface, nothing should break. The protocol’s keepers and front-end app have historically handled these transitions without visible disruption. But for the developers and protocols that plug directly into GMX’s smart contract layer, the clock is ticking.
What’s actually changing in v2.2c
The v2.2c contracts introduce expanded invariant checks and role-management protections. Funding mechanisms have been updated, oracle validations refined, and collateral caps adjusted.
For integrators specifically, the migration involves more than flipping a switch. New ExchangeRouter, Reader, and SimulationRouter addresses need to be plugged in. ABIs have changed. Various struct definitions have been modified. Anyone who built custom tooling around v2.2b’s specific contract interfaces will need to audit and update their code.
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The migration mechanics
GMX has published deployment addresses and comprehensive changelogs on its GitHub repository. The protocol first flagged the v2.2b deprecation timeline on August 17, 2026, giving integrators roughly a month to prepare.
One nuance worth noting is the three-chain deployment across Arbitrum, Avalanche, and MegaETH. Each chain has its own set of contract addresses, meaning integrators operating across multiple networks need to update their configurations for each one independently. A missed address on one chain could mean partial functionality loss even if the other two are correctly configured.
The September 14 deadline is firm. Integrators who haven’t started their migration should probably clear their calendars, because v2.2b contracts won’t be sending back friendly error messages once they’re disabled. They simply won’t work.