Standard Stacks - Mainnet - Upgrade to 4.0.5

Scheduled for Oct 21, 00:00 - 23:59 UTC

Scheduled

We are upgrading our Stacks Mainnet infrastructure to stacks-core 4.0.5 on 2026-10-21. This release includes bugfixes and stability improvements for block production, along with miner and signer stall fixes. Brief interruptions to RPC availability may occur on that date.

RPC Changes:
- /v3/stacker_set — RPC OpenAPI schema and example updated for PoX-5 reward sets, now with a separate dedicated schema.
- RPC OpenAPI descriptions, schemas and examples — Updated across the board for Epoch 4.0 and PoX-5 compatibility.

https://github.com/stacks-network/stacks-core/releases/tag/4.0.5

Posted Oct 14, 2026 - 18:12 UTC

This scheduled maintenance affects: Stacks (Stacks - Mainnet, Stacks - Testnet).