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Add FastMCP 4.0 preview notice to installation guide (#2831)

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Co-authored-by: Claude <noreply@anthropic.com>
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Jeremiah Lowin 2026-01-10 11:41:44 -05:00 • committed by GitHub
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docs/getting-started/installation.mdx
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@ -85,7 +85,19 @@ fastmcp==2.11.0 # Good
fastmcp>=2.11.0 # Bad - will install breaking changes
```
See the full [versioning and release policy](/development/releases#versioning-policy) for details on our public API, deprecation practices, and breaking change philosophy.
See the full [versioning and release policy](/development/releases#versioning-policy) for details on our public API, deprecation practices, and breaking change philosophy.
### Looking Ahead: FastMCP 4.0
The MCP Python SDK v2 is expected in early 2026 and will include breaking changes. When released, FastMCP will incorporate these upstream changes in a new major version (FastMCP 4.0).
To avoid unexpected breaking changes, we recommend pinning your dependency with an upper bound:
```
fastmcp>=3.0,<4
```
We'll provide migration guidance when FastMCP 4.0 is released.
## Contributing to FastMCP