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Zod 4. The minimum supported @modelcontextprotocol/sdk is now 1.23.0, the first
release that accepts Zod 4 schemas; 1.22.x requires Zod 3.
Security
Lockfile bumps of fast-uri to 3.1.8 and ip-address to 10.7.3, clearing the two
moderate audit advisories in the MCP SDK's dependencies.
Internal
Lockfile bumps of @modelcontextprotocol/sdk to 1.31.0 and the dev dependency @types/node to 26.6.4.
The release workflow retries the MCP Registry publish while npm is still processing
the new version, instead of failing the run. npm serves a new version a minute or two
after accepting it, and the registry validates against npm.