# Cosmos Docs: Cosmos SDK v0.55

> Developer documentation for the Cosmos stack. Build secure, reliable, and high-performance blockchains.

## v0.55

- [Cosmos SDK / v0.55 / Cosmos SDK (180 pages)](https://docs.cosmos.network/_llms/cosmos-sdk/v0-55/cosmos-sdk.md): Documentation for Cosmos SDK / v0.55 / Cosmos SDK.
- [Cosmos SDK / v0.55 / API Reference (131 pages)](https://docs.cosmos.network/_llms/cosmos-sdk/v0-55/api-reference.md): Documentation for Cosmos SDK / v0.55 / API Reference.

### Release Notes

- [v0.55 Release Notes](https://docs.cosmos.network/sdk/latest/upgrade/v0.55-release.md): What's new in the 2026.1 Ledger Security release: post-quantum keys, validator consensus key rotation, and remote signing with Cosmos-KMS.

## OpenAPI Specs

- [openapi](/sdk/latest/api-reference/rest/openapi.yaml)