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aiohttp **3.14.0** (released 2026-06-01) removed `aiohttp.streams.AsyncStreamReaderMixin`. The current release of `vcrpy` (8.1.1) still subclasses it in its aiohttp stub: ```python class MockStream(asyncio.StreamReader, streams.AsyncStreamReaderMixin): ``` As a result, the VCR fixture fails to import during test setup, and the scheduled integration tests for the `fireworks` and `xai` partners error out at `test_stream_time`: ``` AttributeError: module 'aiohttp.streams' has no attribute 'AsyncStreamReaderMixin' ``` Only these two partners are affected because their SDKs use `aiohttp`, so VCR loads its aiohttp stub; partners on `httpx` (e.g. `anthropic`, `openai`) are unaffected. This is an upstream incompatibility tracked at kevin1024/vcrpy#995, with a fix in kevin1024/vcrpy#996 that has not yet been released. Until a fixed `vcrpy` ships, this caps `aiohttp<3.14.0` via `[tool.uv] constraint-dependencies` (the same mechanism already used for the `pygments` CVE pin) in both packages. Using a constraint rather than tightening the published `aiohttp>=3.9.1,<4.0.0` range means the change only affects local/CI resolution — the package metadata users install against is untouched. Both lockfiles re-resolve to `aiohttp` 3.13.5, which still provides the removed attribute. A code comment points back to the upstream fix so the pin can be removed once it lands.
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