Drop support for Python 3.9

.github/workflows/ci.yml

@@ -68,16 +68,17 @@ jobs:
       matrix:
         python-version:
           [
-            "3.9",
             "3.10",
             "3.11",
             "3.14",
             "3.13",
-            "3.13t",
             "3.14",
             "3.14t",
+            "3.15",
+            "3.15t",
             "pypy-3.11",
-            "graalpy25.0",
+            "graalpy-25.2", # 3.12
+            "graalpy-25.3", # 3.13
           ]
         platform:
           [
@@ -130,23 +131,6 @@ jobs:
                 python-architecture: "arm64",
                 rust-target: "aarch64-unknown-linux-gnu",
               }
-        exclude:
-          # macOS arm doesn't have Python builds before 3.10
-          - python-version: 3.9
-            platform:
-              {
-                os: "macos-latest",
-                python-architecture: "arm64",
-                rust-target: "aarch64-apple-darwin",
-              }
-          # no graalpy available on Windows
-          - python-version: graalpy25.0
-            platform:
-              {
-                os: "windows-latest",
-                python-architecture: "x64",
-                rust-target: "x86_64-pc-windows-msvc",
-              }
 
     env:
       SETUPTOOLS_RUST_CARGO_PROFILE: dev
@@ -357,7 +341,7 @@ jobs:
           targets: aarch64-apple-darwin,x86_64-apple-darwin
       - uses: pypa/cibuildwheel@v3.4.1
         env:
-          CIBW_BUILD: cp39-*
+          CIBW_BUILD: cp310-*
           CIBW_BEFORE_BUILD: >
             pip install -U 'pip>=23.2.1' 'setuptools>=70.1.0' 'auditwheel>=5.4.0'
             && pip install -e .
@@ -390,6 +374,8 @@ jobs:
               rust_target: i686-pc-windows-gnu,
             },
           ]
+    env:
+      CARGO_BUILD_TARGET: ${{ matrix.rust_target }}
     steps:
       - uses: actions/checkout@v6
       - name: Install MSys2 and dependencies
@@ -404,9 +390,9 @@ jobs:
             mingw-w64-${{ matrix.arch }}-openssl
             mingw-w64-${{ matrix.arch }}-toolchain
 
-      - uses: dtolnay/rust-toolchain@master
+      - uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: stable-${{ matrix.rust_target }}
+          targets: ${{ matrix.rust_target }}
 
       - name: Install test dependencies
         shell: msys2 {0}

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Unreleased
+### Packaging
+- Drop support for Python 3.9.
+- Bump `setuptools` minimum version to 83.0.
+
 ## 1.13.0 (2026-06-27)
 ### Added
 - Add `generated-files` option to `RustExtension` to copy files from the build script output directory to the wheel. [#574](https://github.com/PyO3/setuptools-rust/pull/574)

README.md

@@ -69,7 +69,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-pyo3 = "0.25"
+pyo3 = "0.28"
 
 [lib]
 name = "_lib"  # private module to be nested into Python package,

docs/conf.py

@@ -80,12 +80,10 @@ def basetext(o):
             for t in node.traverse(basetext):
                 t1 = Text(t.replace(DOCS_URL, "", 1), t.rawsource)
                 t.parent.replace(t, t1)
-        return
 
 
 # end of class
 
 
 def setup(app):
     app.add_transform(RelativeDocLinks)
-    return

examples/generated-files/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2021"
 build = "build.rs"
 
 [dependencies]
-pyo3 = "0.27"
+pyo3 = "0.28"
 
 [lib]
 name = "_lib"  # private module to be nested into Python package

examples/generated-files/python/generated_files/__init__.py

@@ -1,6 +1,7 @@
-__all__ = ["library_ok", "data_files_content"]
+__all__ = ["data_files_content", "library_ok"]
 
 from pathlib import Path
+
 from ._lib import library_ok
 
 

examples/generated-files/tests/test_lib.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+
 import generated_files
 
 

examples/hello-world-setuppy/Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
-pyo3 = "0.28"
+pyo3 = "0.29.2"
 
 [lib]
 # See https://github.com/PyO3/pyo3 for details