Adapter Goes Live on Mainnet Stellar's (@StellarOrg) Protocol 28, codenamed Adapter, is now live on mainnet following a validator vote on September 16, 2026. Validators approved the upgrade o
Stellar's (@StellarOrg) Protocol 28, codenamed Adapter, is now live on mainnet following a validator vote on September 16, 2026. Validators approved the upgrade on September 16, 2026, with Adapter going active within hours of the vote.This marks the official rollout, following a testnet run back in August.
It is a builder-focused release: most of what is inside makes life easier for the people writing smart contracts on Stellar, while a change under the hood helps the network reach consensus faster as it continues to scale.
Adapter bundles three distinct technical proposals. The most significant infrastructure change, known as CAP-83, addresses a long-standing bottleneck in the consensus process. Right now, validators need a complete transaction set before confirming the next ledger. CAP-83 lets validators start voting before the full set arrives, keeping consensus moving even when transaction data is slow to propagate across the network.
On the smart contract side, CAP-85 allows groups of smart contracts that share code to upgrade together in one move, instead of updating each one by one.It introduces a shared, updatable code reference that multiple contracts can point back to. Change that single reference, and every connected contract upgrades at the same moment, no matter how many there are. The third proposal, CAP-86, eases migration of contract data during structure updates, reducing friction for developers managing evolving applications.
The full performance gains will be phased in after mainnet as parallel transaction-set downloading is gradually enabled. Stellar says the upgrade is designed to support larger and more complex applications on the network.
For ordinary users, the changes are largely invisible at the surface level. For everyday users, little changes at first glance. Stellar payment systems still move the same way. But behind the scenes, the network just got a meaningful boost in how it handles growth.
Sources:Stellar Development Foundation: Introducing Adapter, Protocol 28Stellar Development Foundation: Protocol 28 Upgrade GuideCoin Gabbar: Stellar Protocol 28 Live on Mainnet
