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Add Python 3.15 support and drop Python 3.9 - #430
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mxamin
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Oct 23, 2026
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- Build cp315 wheels: bump cibuildwheel 3.3 -> 4.3.4 (cp315 is built by default since 4.2) and add cp315-* to the build list.
- Bump lxml to 6.1.3, the first release with cp315 wheels.
- Add 3.15 to the manylinux, macOS, sdist, linuxbrew and Travis matrices.
- Drop Python 3.9 (EOL): requires-python >=3.10, classifiers, cibuildwheel build list, CI matrices, and ruff target-version py310 (adds strict=True to the one zip() flagged by B905).
- Leak harness: count surviving young-generation objects with len(gc.get_objects(0)) instead of gc.get_count()[0]. With the GC disabled, CPython 3.15's young-generation counter drifts upward even when no objects survive, which tripped "unreferenced objects detected" in TestCallbacks. The new check still catches retained and unreachable reference cycles.
- Build cp315 wheels: bump cibuildwheel 3.3 -> 4.3.4 (cp315 is built by default since 4.2) and add cp315-* to the build list. - Bump lxml to 6.1.3, the first release with cp315 wheels. - Add 3.15 to the manylinux, macOS, sdist, linuxbrew and Travis matrices. - Drop Python 3.9 (EOL): requires-python >=3.10, classifiers, cibuildwheel build list, CI matrices, and ruff target-version py310 (adds strict=True to the one zip() flagged by B905). - Leak harness: count surviving young-generation objects with len(gc.get_objects(0)) instead of gc.get_count()[0]. With the GC disabled, CPython 3.15's young-generation counter drifts upward even when no objects survive, which tripped "unreferenced objects detected" in TestCallbacks. The new check still catches retained and unreachable reference cycles.
Windows ARM64 wheel builds have failed since the windows-11-arm runner moved to the VS2026 image (MSVC 14.44 -> 14.51) with C1047: the prebuilt iconv_a.lib was compiled with /GL, which only links with the exact same compiler build. - Download Windows libs from win-binaries release 2026.10.23, where libiconv is built without /GL. - Run the AMD64 Windows jobs on windows-2025-vs2026, since the libs are now built with VS2026 and need a linker at least that new. - Windows libs: iconv 1.19-1, libxml2 2.11.9-8, libxslt 1.1.45, openssl 3.5.9, xmlsec 1.3.12, zlib 1.3.2. - Unix libs: libiconv 1.19, openssl 3.6.5, xmlsec1 1.3.12, zlib 1.3.2. libxml2 stays at 2.14.6 to match lxml, and libxslt stays at 1.1.43 because 1.1.44+ requires libxml2 >= 2.15.1.
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