# MCP specification — changelog

**Vendor:** Model Context Protocol  
**Official:** https://modelcontextprotocol.io  
**Tracked releases:** 9  
**Breaking changes:** 0  
**Latest:** 2026-07-28 (2026-07-28)  
**Tracked since:** 2024-11-06

## Releases

| Date | Version | Sig | Breaking | Title |
|---|---|---|---|---|
| 2026-07-28 | 2026-07-28 | 5 |  | [MCP spec: 2026-07-28 revision goes stable](https://changelogs.info/mcp-spec/2026-07-28) |
| 2026-05-29 | 2026-07-28-RC | 3 |  | [MCP spec: 2026-07-28 release candidate published](https://changelogs.info/mcp-spec/2026-07-28-rc) |
| 2025-11-25 | 2025-11-25 | 5 |  | [MCP spec: 2025-11-25 revision goes stable](https://changelogs.info/mcp-spec/2025-11-25) |
| 2025-11-15 | 2025-11-25-RC | 3 |  | [MCP spec: 2025-11-25 release candidate published](https://changelogs.info/mcp-spec/2025-11-25-rc) |
| 2025-06-18 | 2025-06-18 | 5 |  | [MCP specification: 2025-06-18 revision published](https://changelogs.info/mcp-spec/2025-06-18) |
| 2025-03-26 | 2025-03-26 | 5 |  | [MCP specification: 2025-03-26 revision published](https://changelogs.info/mcp-spec/2025-03-26) |
| 2025-03-26 | 2024-11-05-final | 2 |  | [MCP specification: 2024-11-05 revision finalised](https://changelogs.info/mcp-spec/2024-11-05-final) |
| 2025-01-17 | 2024-11-05 | 4 |  | [Model Context Protocol: initial 2024-11-05 specification revision](https://changelogs.info/mcp-spec/2024-11-05) |
| 2024-11-06 | 2024-10-07 | 1 |  | [MCP specification 2024-10-07: final update, no described changes](https://changelogs.info/mcp-spec/2024-10-07) |

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Canonical: https://changelogs.info/mcp-spec
Full timeline: https://changelogs.info/mcp-spec/timeline
JSON: https://changelogs.info/api/tools/mcp-spec.json