PyO3's maximum supported version (3.13)

[lianghong]

error: the configured Python interpreter version (3.14) is newer than PyO3's maximum supported version (3.13)

So modify pyproject.toml with -
requires-python = "==3.13"

[natesilva]

Similar problem. Pydantic doesn’t accept 3.14 by default. I fixed it by downgrading to Python 3.13 for now.

 [stdout]
      Running `maturin pep517 build-wheel -i
      /Users/nate/.cache/uv/builds-v0/.tmp7oVYMZ/bin/python --compatibility
      off`
      cargo 1.91.1 (ea2d97820 2025-10-10)
      Rust not found, installing into a temporary directory

      [stderr]
      Python reports SOABI: cpython-314-darwin
      Computed rustc target triple: aarch64-apple-darwin
      Installation directory: /Users/nate/Library/Caches/puccinialin
      Rustup already downloaded
      Installing rust to /Users/nate/Library/Caches/puccinialin/rustup
      warn: It looks like you have an existing rustup settings file at:
      warn: /Users/nate/.rustup/settings.toml
      warn: Rustup will install the default toolchain as specified in the
      settings file,
      warn: instead of the one inferred from the default host triple.
      info: profile set to 'minimal'
      info: default host triple is aarch64-apple-darwin
      warn: Updating existing toolchain, profile choice will be ignored
      info: syncing channel updates for 'stable-aarch64-apple-darwin'
      info: default toolchain set to 'stable-aarch64-apple-darwin'
      Checking if cargo is installed
      📦 Including license file `LICENSE`
      🍹 Building a mixed python/rust project
      🔗 Found pyo3 bindings
      🐍 Found CPython 3.14 at
      /Users/nate/.cache/uv/builds-v0/.tmp7oVYMZ/bin/python
      📡 Using build options features, bindings from pyproject.toml
      💻 Using `MACOSX_DEPLOYMENT_TARGET=11.0` for aarch64-apple-darwin by
      default
         Compiling pyo3-build-config v0.22.6
         Compiling pyo3-ffi v0.22.6
         Compiling pyo3-macros-backend v0.22.6
         Compiling pyo3 v0.22.6
         Compiling jiter v0.7.1
         Compiling pydantic-core v2.27.2
      (/Users/nate/.cache/uv/sdists-v6/pypi/pydantic-core/2.27.2/Vo2cL5iUD8Wr-7AcLD6q3/src)
      error: failed to run custom build command for `pyo3-ffi v0.22.6`

      Caused by:
        process didn't exit successfully:
      `/Users/nate/.cache/uv/sdists-v6/pypi/pydantic-core/2.27.2/Vo2cL5iUD8Wr-7AcLD6q3/src/target/release/build/pyo3-ffi-7d4b7ca7ee1ac1f8/build-script-build`
      (exit status: 1)
        --- stdout
        cargo:rustc-check-cfg=cfg(Py_LIMITED_API)
        cargo:rustc-check-cfg=cfg(PyPy)
        cargo:rustc-check-cfg=cfg(GraalPy)
        cargo:rustc-check-cfg=cfg(py_sys_config, values("Py_DEBUG",
      "Py_REF_DEBUG", "Py_TRACE_REFS", "COUNT_ALLOCS"))
        cargo:rustc-check-cfg=cfg(invalid_from_utf8_lint)
        cargo:rustc-check-cfg=cfg(pyo3_disable_reference_pool)
        cargo:rustc-check-cfg=cfg(pyo3_leak_on_drop_without_reference_pool)
        cargo:rustc-check-cfg=cfg(diagnostic_namespace)
        cargo:rustc-check-cfg=cfg(c_str_lit)
        cargo:rustc-check-cfg=cfg(Py_3_7)
        cargo:rustc-check-cfg=cfg(Py_3_8)
        cargo:rustc-check-cfg=cfg(Py_3_9)
        cargo:rustc-check-cfg=cfg(Py_3_10)
        cargo:rustc-check-cfg=cfg(Py_3_11)
        cargo:rustc-check-cfg=cfg(Py_3_12)
        cargo:rustc-check-cfg=cfg(Py_3_13)
        cargo:rerun-if-env-changed=PYO3_CROSS
        cargo:rerun-if-env-changed=PYO3_CROSS_LIB_DIR
        cargo:rerun-if-env-changed=PYO3_CROSS_PYTHON_VERSION
        cargo:rerun-if-env-changed=PYO3_CROSS_PYTHON_IMPLEMENTATION
        cargo:rerun-if-env-changed=PYO3_PRINT_CONFIG
        cargo:rerun-if-env-changed=PYO3_USE_ABI3_FORWARD_COMPATIBILITY

        --- stderr
        error: the configured Python interpreter version (3.14) is newer than
      PyO3's maximum supported version (3.13)
        = help: please check if an updated version of PyO3 is available.
      Current version: 0.22.6
        = help: set PYO3_USE_ABI3_FORWARD_COMPATIBILITY=1 to suppress this
      check and build anyway using the stable ABI
      warning: build failed, waiting for other jobs to finish...
      💥 maturin failed
        Caused by: Failed to build a native library through cargo
        Caused by: Cargo build finished with "exit status: 101": `env -u
      CARGO MACOSX_DEPLOYMENT_TARGET="11.0" PYO3_BUILD_EXTENSION_MODULE="1"
      PYO3_ENVIRONMENT_SIGNATURE="cpython-3.14-64bit"
      PYO3_PYTHON="/Users/nate/.cache/uv/builds-v0/.tmp7oVYMZ/bin/python"
      PYTHON_SYS_EXECUTABLE="/Users/nate/.cache/uv/builds-v0/.tmp7oVYMZ/bin/python"
      "cargo" "rustc" "--profile" "release" "--features"
      "pyo3/extension-module" "--message-format"
      "json-render-diagnostics" "--manifest-path"
      "/Users/nate/.cache/uv/sdists-v6/pypi/pydantic-core/2.27.2/Vo2cL5iUD8Wr-7AcLD6q3/src/Cargo.toml"
      "--lib" "--crate-type" "cdylib" "--" "-C"
      "link-arg=-undefined" "-C" "link-arg=dynamic_lookup" "-C"
      "link-args=-Wl,-install_name,@rpath/pydantic_core._pydantic_core.cpython-314-darwin.so"`
      Error: command ['maturin', 'pep517', 'build-wheel', '-i',
      '/Users/nate/.cache/uv/builds-v0/.tmp7oVYMZ/bin/python',
      '--compatibility', 'off'] returned non-zero exit status 1

  help: `pydantic-core` (v2.27.2) was included because `kagimcp` (v0.1.3)
        depends on `pydantic` (v2.10.6) which depends on `pydantic-core`

[rehanzo]

kagimcp should not need pyo3. Is this related to another project? If so, that should be built in its own venv.