Polkadot Sdk (2509) event

Event · PageRank 0.0000

Overview

polkadot-stable2509 is a stable release of the Polkadot SDK, published on 8 October 2025 by Parity Technologies, carrying node version v1.20.0 and containing the changes accumulated since polkadot-stable2506. It bundles node and runtime fixes including a correction to the Aura authority-set tracker that had prevented new authorities from being added, a fix for a deadlock during statement gossiping under high load, a GRANDPA fix for peer disconnections caused by justifications sent across an authority set change, and persistence of the authority-discovery address cache to speed reconnection after restart. Parity subsequently shipped patch releases in the stable2509 line through 2026.

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Frequently asked questions

When was polkadot-stable2509 released?

8 October 2025, following release candidates in September and early October 2025.

What node version does it correspond to?

Node version v1.20.0; the release is also tagged as polkadot-v1.20.0 under the older naming pattern.

What notable fixes does it include?

Among others, a fix to the Aura authority tracker so new authorities can be introduced, a fix for a statement-gossip deadlock under load, a GRANDPA fix for disconnects caused by justifications across an authority set change, and file persistence for the authority-discovery address cache.