build(deps): bump the runtime group with 3 updates

[dependabot]

Bumps the runtime group with 3 updates: mcp, starlette and uvicorn.

Updates mcp from 1.28.1 to 2.0.0

Release notes

Sourced from mcp's releases.

v2.0.0

MCP Python SDK v2 Stable Release

This is v2.0.0, the stable v2 release of the MCP Python SDK. It supports the 2026-07-28 revision of the Model Context Protocol and serves every earlier revision from the same server. pip install mcp now installs 2.x.

pip install "mcp[cli]"
# or
uv add "mcp[cli]"

Documentation Rewrite

The documentation has the full tutorial and API reference. Coming from v1? What's new in v2 is the tour of what changed and why, and the migration guide lists every breaking change with before-and-after code.

V1 Maintenance mode

v1.x is in maintenance mode and will only receive security fixes from now on The 1.x line lives on the v1.x branch, continues to receive critical bug fixes and security patches, and is documented at https://py.sdk.modelcontextprotocol.io/v1/. If your project is not ready to migrate, keep a <2 upper bound on your requirement (for example mcp>=1.28,<2).

Highlights

One SDK, both protocol eras

v2 speaks the 2026-07-28 revision (stateless requests with no handshake, server/discover, subscriptions/listen, multi-round-trip requests) and still serves every 2025-era client from the same MCPServer, over Streamable HTTP and stdio, with nothing to configure. Client(target) negotiates the version automatically.

FastMCP is now MCPServer, and there is a first-class Client

The decorator API is unchanged; the low-level Server is rebuilt around a shared dispatcher engine, and one Client object replaces v1's transport-plus-ClientSession-plus-initialize() layering. It connects to a URL, a stdio subprocess, a custom transport, or straight to a server object in memory for tests.

Multi-round-trip requests and resolver dependency injection

At 2026-07-28 the server can no longer call the client, so tools return the question instead. A Resolve(fn) parameter is filled by your function invisibly to the model and can put a question to the user; one tool body serves both eras.

Extension APIs, OpenTelemetry, and a standalone types package

Servers and clients compose protocol extensions through pluggable extension APIs (MCP Apps built in); OpenTelemetry tracing ships on by default; every protocol type is its own package, mcp-types (imported as mcp_types), published in lock-step with mcp.

Hardened stdio and auth

stdio servers keep handler subprocesses and stray prints off the wire, and stdout is diverted to stderr while serving. OAuth adds RFC 9207 issuer validation, the SEP-990 identity-assertion flow, and the client-credentials extension.

Coming from a v2 pre-release

Since the last release candidate: the per-version wire packages are private (mcp_types._v*), mcp.types is a permanent alias for mcp_types, the auth registration request model is split from the registered-client record, cancelled requests are no longer answered, and log notifications are gated on the per-request log-level opt-in at 2026-07-28. Since the betas: Client(cache=False) is now cache=None with CacheConfig() the default; Context.client_id, RFC7523OAuthClientProvider, and OAuthClientProvider(timeout=) are removed; the client-credentials providers take scope=; message_handler receives notifications and exceptions only; FileResource(is_binary=) becomes encoding; MCP_* env vars are gone with pydantic-settings; Streamable HTTP servers reject bodies over 4 MiB with HTTP 413. The migration guide covers all of it.

Known gaps

The tasks extension (SEP-2663) is not part of this release. On the client, the DPoP proof binding (SEP-1932) and the workload-identity jwt-bearer grant are not implemented; both are additive and can land in 2.x.

Feedback

... (truncated)

Commits

• 6f69a37 Present v2 as the stable release across the README, docs, and policies (#3178)
• 78e6fbb Serve v2 docs at the site root, with permanent per-major paths (#3176)
• af06330 Remove unused StreamableHTTPTransport.get_session_id() (#3205)
• 68ca87e Document the two-line release process for stable v2 (#3179)
• c9c431b Expose the middleware chain on MCPServer and stop sending unrequested change ...
• 528e366 Fail fast on server-to-client requests in JSON-response mode instead of hangi...
• 27f5cc7 Remove unused mcpserver.exceptions.ValidationError (#3199)
• 89c5e70 Gate log notifications on the per-request log-level opt-in at 2026-07-28 (#3198)
• b61ce38 docs: fix off-by-one hl_lines in apps.md (#3196)
• b7c9a91 Add mcp.types as a permanent alias for mcp_types (#3190)
• Additional commits viewable in compare view

Updates starlette from 1.3.1 to 1.5.0

Release notes

Sourced from starlette's releases.

Version 1.5.0

This release is all about giving GZipMiddleware some love. 🗜️

What's Changed

• Add exclude_content_types parameter to GZipMiddleware by @​Kludex in encode/starlette#3418
• Flush GZip output for each streamed chunk by @​Kludex in encode/starlette#3419
• Skip compression of partial responses in GZipMiddleware by @​Kludex in encode/starlette#3420
• Expand default excluded content types in GZipMiddleware by @​Kludex in encode/starlette#3421

Full Changelog: Kludex/starlette@1.4.1...1.5.0

Version 1.4.1

What's Changed

• Default thread_minimum_size in GZipResponder by @​Kludex in Kludex/starlette#3415

Full Changelog: Kludex/starlette@1.4.0...1.4.1

Version 1.4.0

What's Changed

• Lazily allocate GZipMiddleware compression resources by @​Kludex in Kludex/starlette#3407
• Use zlib.compressobj instead of GzipFile in GZipMiddleware by @​Kludex in Kludex/starlette#3411
• Offload large GZip compression by @​Kludex in Kludex/starlette#3410

New Contributors

• @​benberryallwood made their first contribution in Kludex/starlette#3334
• @​lkk7 made their first contribution in Kludex/starlette#3359

Full Changelog: Kludex/starlette@1.3.1...1.4.0

Changelog

Sourced from starlette's changelog.

1.5.0 (August 8, 2026)

Added

• Add exclude_content_types parameter to GZipMiddleware #3418.

Changed

• Expand default excluded content types in GZipMiddleware #3421.

Fixed

• Flush GZip output for each streamed chunk #3419.
• Skip compression of partial responses in GZipMiddleware #3420.

1.4.1 (August 5, 2026)

Fixed

• Default thread_minimum_size to 128 KiB in GZipResponder, keeping it usable without the new keyword argument #3415.

1.4.0 (August 5, 2026)

Added

• Offload large GZip compression to a worker thread, keeping the event loop responsive. GZipMiddleware accepts a new thread_minimum_size parameter (default 128 KiB) controlling the minimum body chunk size compressed in a thread #3410.

Changed

• Use zlib.compressobj instead of GzipFile in GZipMiddleware, reducing memory usage during compression #3411.
• Lazily allocate GZipMiddleware compression resources, avoiding compressor allocation for responses that are never compressed #3407.

Commits

• 07cb508 Version 1.5.0 (#3427)
• 45fb390 Add routing benchmarks (#3425)
• f1dc9b6 Expand default excluded content types in GZipMiddleware (#3421)
• b07b8c6 Skip compression of partial responses in GZipMiddleware (#3420)
• d438d39 Flush GZip output for each streamed chunk (#3419)
• 99b7cc6 Add exclude_content_types parameter to GZipMiddleware (#3418)
• f752519 chore(deps): bump pymdown-extensions from 10.21.3 to 11.0 (#3393)
• 9c55062 Version 1.4.1 (#3416)
• 152cef4 Default thread_minimum_size in GZipResponder (#3415)
• 3d6d6c2 Version 1.4.0 (#3413)
• Additional commits viewable in compare view

Updates uvicorn from 0.51.0 to 0.52.1

Release notes

Sourced from uvicorn's releases.

Version 0.52.1

Fixed

• Complete the closing handshake on server-initiated WebSocket closes in the websockets-sansio and wsproto implementations, waiting for the client's close reply with a 10 second timeout instead of resetting the connection (#3053)
• Add missing write flow control to the websockets-sansio implementation, preventing data truncation on server-initiated closes with large in-flight payloads (#3048)
• Handle connection loss while a WebSocket write is waiting on backpressure (#3050)
• Remove duplicate Content-Type and Content-Length headers from WebSocket denial responses on the websockets-sansio implementation, and deliver non-UTF-8 denial bodies intact (#3041)

Full Changelog: Kludex/uvicorn@0.52.0...0.52.1

Version 0.52.0

This release adds an experimental HTTP/1.1 implementation backed by zttp, a sans-IO HTTP parser I've been developing on the side: a core written in Zig, with bindings to Python. It has been running under a fuzzer for some weeks now, and has been through multiple rounds of security auditing.

It is still experimental, so don't put it in front of production traffic yet. Try it with --http zttp, and please send any feedback to the issue tracker.

Added

• Add an experimental zttp HTTP/1.1 implementation, selectable with --http zttp (#2979)

Fixed

• Keep non-ASCII WebSocket request headers intact with websockets 17.0, which encodes them with ISO-8859-1 (#3036)

Full Changelog: Kludex/uvicorn@0.51.0...0.52.0

Changelog

Sourced from uvicorn's changelog.

0.52.1 (August 1, 2026)

Fixed

• Complete the closing handshake on server-initiated WebSocket closes in the websockets-sansio and wsproto implementations, waiting for the client's close reply with a 10 second timeout instead of resetting the connection (#3053)
• Add missing write flow control to the websockets-sansio implementation, preventing data truncation on server-initiated closes with large in-flight payloads (#3048)
• Handle connection loss while a WebSocket write is waiting on backpressure (#3050)
• Remove duplicate Content-Type and Content-Length headers from WebSocket denial responses on the websockets-sansio implementation, and deliver non-UTF-8 denial bodies intact (#3041)

0.52.0 (July 29, 2026)

This release adds an experimental HTTP/1.1 implementation backed by zttp, a sans-IO HTTP parser I've been developing on the side: a core written in Zig, with bindings to Python. It has been running under a fuzzer for some weeks now, and has been through multiple rounds of security auditing.

It is still experimental, so don't put it in front of production traffic yet. Try it with --http zttp, and please send any feedback to the issue tracker.

Added

• Add an experimental zttp HTTP/1.1 implementation, selectable with --http zttp (#2979)

Fixed

• Keep non-ASCII WebSocket request headers intact with websockets 17.0, which encodes them with ISO-8859-1 (#3036)

Commits

• ee8e45c Version 0.52.1 (#3056)
• b57926d Remove duplicate content headers from WebSocket denial responses on websocket...
• 49de1b9 chore(deps): bump pymdown-extensions from 10.21.3 to 11.0 (#3042)
• 2f3fa3a Complete server-initiated closes in SansIO WebSocket protocols (#3053)
• 8c59d55 chore(deps): bump the github-actions group with 5 updates (#3054)
• e148451 Handle connection loss during WebSocket write backpressure (#3050)
• e16a69b Add missing write flow control to websockets-sansio (#3048)
• ef1dd44 Fold the zttp-only tests back into the HTTP test suite (#3046)
• 8f1b884 Version 0.52.0 (#3044)
• f6833db Add experimental zttp HTTP/1.1 protocol (#2979)
• Additional commits viewable in compare view

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[hellices]

Closing in favour of #260, which tracks the mcp 2.0 migration properly.

The group failed on mcp alone — starlette 1.3.1 → 1.5.0 and uvicorn 0.51.0 → 0.52.1 are fine and will return in the next runtime group once the major is scoped out (PR pending).

[dependabot]

This pull request was built based on a group rule. Closing it will not ignore any of these versions in future pull requests.

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