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fix(deps): Reduce FastAPI library required version to 0.95.0 #372

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Merged
merged 2 commits into from
Jul 31, 2025
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fix(deps): Reduce FastAPI library required version to 0.95.0 #372

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fix(deps): Reduce FastAPI library required version to `0.95.0`
holtskinner Jul 31, 2025
7bde267
Merge branch 'main' into change-fastapi-requirements
holtskinner Jul 31, 2025
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2 changes: 1 addition & 1 deletion pyproject.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ authors = [{ name = "Google LLC", email = "googleapis-packages@google.com" }]
requires-python = ">=3.10"
keywords = ["A2A", "A2A SDK", "A2A Protocol", "Agent2Agent", "Agent 2 Agent"]
dependencies = [
"fastapi>=0.116.1",
"fastapi>=0.95.0",
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Lowering the FastAPI version is a good goal for compatibility, but fastapi<0.100.0 is not compatible with Pydantic v2. This project requires pydantic>=2.11.3, and the codebase uses Pydantic v2 features (e.g., model_json_schema in src/a2a/server/apps/jsonrpc/fastapi_app.py).

FastAPI introduced support for Pydantic v2 in version 0.100.0. Using a version lower than that will cause dependency resolution issues or runtime errors.

To ensure compatibility, the minimum version of FastAPI should be at least 0.100.0. This still significantly lowers the version requirement from 0.116.1 while ensuring the project remains functional.

  "fastapi>=0.100.0",

"httpx>=0.28.1",
"httpx-sse>=0.4.0",
"pydantic>=2.11.3",
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