Adapter, Protocol 28 Upgrade Timeline

[Justin]

Today, we announced the rollout plan for Stellar Adapter, Protocol 28. Woo-hoo!

Key dates
• August 13, 2026 — Stellar Core stable release available.
• August 13-21, 2026 — Additional stable releases (infrastructure and SDKs) available.
• August 27, 2026, 1700 UTC — Testnet upgrade.
• September 16, 2026, 1700 UTC — Mainnet upgrade vote.

This upgrade introduces enhancements that make it easier to write smart contracts on Stellar, as well as a change under the hood that helps the network reach consensus faster as it continues to scale.  It should be minimally disruptive for users and builders.  For typical SDK-based integrations, we suggest bumping your SDK version before August 27 for Testnet builds, and before September 16 for Mainnet builds.

For information on general upgrade instructions and links to relevant software, check out the upgrade guide:
https://stellar.org/blog/developers/adapter-protocol-28-upgrade-guide

For details on the changes included in the protocol, check out the announcement:
https://stellar.org/blog/developers/introducing-adapter-protocol-28-on-stellar