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Updates the requirements on mcp, fastapi, uvicorn, langchain-core, crewai and cyclonedx-bom to permit the latest version.
Updates mcp from 1.29.1 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 fastapi from 0.139.2 to 0.141.1

Release notes

Sourced from fastapi's releases.

0.141.1

Fixes

  • 🐛 Fix support for background tasks and headers from dependencies in app.frontend(). PR #16105 by @​tiangolo.

Docs

0.141.0

Features

  • ✨ Add app.frontend(check_dir="auto"), to make local development more convenient with fastapi dev. PR #16102 by @​tiangolo.

0.140.13

Fixes

Docs

0.140.12

Fixes

0.140.11

Fixes

  • 🐛 Fix response_model_* params ignored for non-generator endpoints with Iterable[..] return type. PR #15093 by @​YuriiMotov.

0.140.10

Fixes

Internal

0.140.9

Fixes

  • 🐛 Fix exclude_defaults not propagated to dict keys and values in jsonable_encoder. PR #16043 by @​MBGrao.

... (truncated)

Commits
  • 95f8322 🔖 Release version 0.141.1 (#16106)
  • f137944 📝 Update release notes
  • d623544 🐛 Fix support for background tasks and headers from dependencies in `app.fron...
  • 1d211b9 📝 Update release notes
  • 8a1f876 📝 Document FASTAPI_ENV in FastAPI CLI guide (#16104)
  • c7e7b65 🔖 Release version 0.141.0 (#16103)
  • 6bceb84 📝 Update release notes
  • 5429fed ✨ Add app.frontend(check_dir="auto"), to make local development more conven...
  • 628663f 🔖 Release version 0.140.13 (#16096)
  • 0b54fd0 📝 Update release notes
  • Additional commits viewable in compare view

Updates uvicorn from 0.39.0 to 0.52.4

Release notes

Sourced from uvicorn's releases.

Version 0.52.4

Fixed

  • Remove duplicate Date headers from accepted WebSocket handshakes with websockets-sansio (#3078)

Full Changelog: Kludex/uvicorn@0.52.3...0.52.4

Version 0.52.3

Changed

  • Update zttp to 0.0.24 and use its combined receive path, improving HTTP/1.1 request parsing performance (#3067)

Full Changelog: Kludex/uvicorn@0.52.2...0.52.3

Version 0.52.2

Fixed

  • Update zttp to 0.0.22, fixing bodyless request receives and improving HTTP/1 request parsing performance (#3063)

Full Changelog: Kludex/uvicorn@0.52.1...0.52.2

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

Version 0.51.0

What's Changed

... (truncated)

Changelog

Sourced from uvicorn's changelog.

0.52.4 (August 18, 2026)

Fixed

  • Remove duplicate Date headers from accepted WebSocket handshakes with websockets-sansio (#3078)

0.52.3 (August 13, 2026)

Changed

  • Update zttp to 0.0.24 and use its combined receive path, improving HTTP/1.1 request parsing performance (#3067)

0.52.2 (August 13, 2026)

Fixed

  • Update zttp to 0.0.22, fixing bodyless request receives and improving HTTP/1 request parsing performance (#3063)

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)

0.51.0 (July 8, 2026)

Added

  • Restart workers one at a time on SIGHUP, bringing each replacement up before retiring the old worker, so reloads no longer drop requests (#3025)

Removed

  • Remove colorama from the standard extra (#3027)

... (truncated)

Commits

Updates langchain-core to 1.6.0

Release notes

Sourced from langchain-core's releases.

langchain-core==1.6.0

Changes since langchain-core==1.5.6

release(core): 1.6.0 (#39760) fix(core): resolve postponed annotations in StructuredTool._injected_args_keys (#39602) feat(core): add standard model exception types (#39538) fix(core): allow deserializing RunnablePick (#39753) fix(core): make convert_to_openai_function handle callables and non-dict mappings (#39750) fix(core): make subprocess and temporary file tests portable on Windows (#39664) fix(core): fail fast when tool schemas can't resolve forward refs during serialization (#39570) test(core): avoid version-dependent runnable snapshots (#39705) fix(core): require all nested properties for strict tool schemas (#39306) fix(core): remove stale sync-stream xfail [closes #39720] (#39723) perf(core): Lazily import transformers (#38037) fix(core): accept non-dict Mapping values in mustache templates (#39680) docs(core): clarify Runnable pipe coercion [closes #39075] (#39707) fix(core): finalize chain-group runs on BaseException (#39699)

Commits
  • 85602c3 release(core): 1.6.0 (#39760)
  • 5c3538e fix(core): resolve postponed annotations in `StructuredTool._injected_args_ke...
  • 9984a87 feat(core): add standard model exception types (#39538)
  • b3e9eef chore(model-profiles): refresh model profile data (#39751)
  • ded2a1f fix(core): allow deserializing RunnablePick (#39753)
  • 04ae744 fix(core): make convert_to_openai_function handle callables and non-dict ma...
  • 37f2662 feat(langchain): support custom token_counter in ContextEditingMiddleware (#3...
  • 2019bf5 fix(openai): raise clear error on unexpected response type in `_create_chat_r...
  • e92c6db fix(langchain): re-raise non-retryable exceptions in ModelRetryMiddleware (#3...
  • f368888 fix(partners): isolate unit tests from network [closes #39727] (#39729)
  • Additional commits viewable in compare view

Updates crewai to 1.15.17

Release notes

Sourced from crewai's releases.

1.15.17

What's Changed

Features

  • Add declarative conversational flows documentation
  • Synthesize built-in conversational methods for declarations
  • Enable declarations to drive conversational mode
  • Make conversational opt-in unmistakable
  • Carry the AMP slug on tools resolved from a slug reference
  • Handle oversized single messages during chunking

Bug Fixes

  • Fix usage of the URL hostname as MCP HTTP and SSE server_name
  • Close the agent scope on every failed attempt
  • Attribute tool errors to the tool that failed
  • Pin SSRF checks to each redirect hop and peer IP
  • Resolve issues with native tool calls broken over OpenAI Responses API

Documentation

  • Update documentation with a snapshot and changelog for v1.15.16

Contributors

@​Copilot, @​Vidit-Ostwal, @​github-code-quality[bot], @​joaomdmoura, @​lorenzejay, @​lucasgomide, @​theCyberTech

Commits
  • b3ab193 [docs-freeze] docs: snapshot and changelog for v1.15.17 (#7055)
  • 5ddf62a feat: bump versions to 1.15.17 (#7054)
  • 4dfd074 docs(flow): document declarative conversational flows (#7035)
  • 01a156d feat(flow): synthesize the built-in conversational methods for declarations (...
  • 6f16e74 feat(flow): let a declaration drive conversational mode (#7032)
  • dabd123 fix: use the URL hostname as MCP HTTP and SSE server_name (#7048)
  • f0e00df feat(flow): make conversational opt-in unmistakable (#7031)
  • 47fa48d fix: close the agent scope on every failed attempt (#6997)
  • b1c9c89 fix(telemetry): attribute tool errors to the tool that failed (#7043)
  • 7942ce0 test(flow): unskip the conversational graph end-to-end suite (#7030)
  • Additional commits viewable in compare view

Updates cyclonedx-bom from 5.5.0 to 7.3.1

Release notes

Sourced from cyclonedx-bom's releases.

v7.3.1 (2026-07-23)

Bug Fixes

  • Improve error message for non-PEP 621 pyproject.toml (#1080, 6715bd9)

Documentation

What's Changed

New Contributors

Full Changelog: CycloneDX/cyclonedx-python@v7.3.0...v7.3.1

v7.3.0 (2026-03-30)

Features

  • Add -S flag to skip *.pth evaluation during environment analysis (#1032, 55c15d7)

What's Changed

Full Changelog: CycloneDX/cyclonedx-python@v7.2.2...v7.3.0

... (truncated)

Changelog

Sourced from cyclonedx-bom's changelog.

v7.3.1 (2026-07-23)

Bug Fixes

  • Improve error message for non-PEP 621 pyproject.toml (#1080, 6715bd9)

Documentation

v7.3.0 (2026-03-30)

Features

  • Add -S flag to skip *.pth evaluation during environment analysis (#1032, 55c15d7)

v7.2.2 (2026-02-19)

Documentation

v7.2.1 (2025-10-29)

Documentation

v7.2.0 (2025-10-16)

Documentation

  • Add Changelog to project urls (5f38d75)

... (truncated)

Commits
  • 5172a90 chore(release): 7.3.1
  • 6715bd9 fix: improve error message for non-PEP 621 pyproject.toml (#1080)
  • b830c67 chore(deps): Bump actions/setup-python from 6.2.0 to 6.3.0 (#1069)
  • 0b65166 chore(deps-dev): Update uv requirement from 0.11.8 to 0.11.17 (#1062)
  • ac491ab chore(deps): Bump actions/checkout from 6.0.2 to 7.0.0 (#1067)
  • d5ece1b chore(deps): Bump snok/install-poetry from 1.4.1 to 1.4.2 (#1063)
  • 95d4630 chore(deps): Bump zizmorcore/zizmor-action from 0.5.6 to 0.5.7 (#1068)
  • b7abcd5 chore(ci): comments for pinned actions (#1061)
  • 78abbc5 Update CONTRIBUTING.md
  • 3c92172 Update PULL_REQUEST_TEMPLATE.md
  • Additional commits viewable in compare view

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chore(deps): bump the python-dependencies group with 6 updates
f2f59d0 
Updates the requirements on [mcp](https://github.com/modelcontextprotocol/python-sdk), [fastapi](https://github.com/fastapi/fastapi), [uvicorn](https://github.com/Kludex/uvicorn), [langchain-core](https://github.com/langchain-ai/langchain), [crewai](https://github.com/crewAIInc/crewAI) and [cyclonedx-bom](https://github.com/CycloneDX/cyclonedx-python) to permit the latest version.

Updates `mcp` from 1.29.1 to 2.0.0
- [Release notes](https://github.com/modelcontextprotocol/python-sdk/releases)
- [Changelog](https://github.com/modelcontextprotocol/python-sdk/blob/main/RELEASE.md)
- [Commits](modelcontextprotocol/python-sdk@v1.29.1...v2.0.0)

Updates `fastapi` from 0.139.2 to 0.141.1
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.139.2...0.141.1)

Updates `uvicorn` from 0.39.0 to 0.52.4
- [Release notes](https://github.com/Kludex/uvicorn/releases)
- [Changelog](https://github.com/Kludex/uvicorn/blob/main/docs/release-notes.md)
- [Commits](Kludex/uvicorn@0.39.0...0.52.4)

Updates `langchain-core` to 1.6.0
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.3.0...langchain-core==1.6.0)

Updates `crewai` to 1.15.17
- [Release notes](https://github.com/crewAIInc/crewAI/releases)
- [Commits](crewAIInc/crewAI@0.95.0...1.15.17)

Updates `cyclonedx-bom` from 5.5.0 to 7.3.1
- [Release notes](https://github.com/CycloneDX/cyclonedx-python/releases)
- [Changelog](https://github.com/CycloneDX/cyclonedx-python/blob/main/CHANGELOG.md)
- [Commits](CycloneDX/cyclonedx-python@v5.5.0...v7.3.1)

---
updated-dependencies:
- dependency-name: mcp
  dependency-version: 2.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: python-dependencies
- dependency-name: fastapi
  dependency-version: 0.141.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python-dependencies
- dependency-name: uvicorn
  dependency-version: 0.52.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python-dependencies
- dependency-name: langchain-core
  dependency-version: 1.6.0
  dependency-type: direct:development
  dependency-group: python-dependencies
- dependency-name: crewai
  dependency-version: 1.15.17
  dependency-type: direct:development
  dependency-group: python-dependencies
- dependency-name: cyclonedx-bom
  dependency-version: 7.3.1
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: python-dependencies
...

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