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Add support for Python 3.14 #2610
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hey, hello, as of right now i'm writing this python 3.14 released, and i unexpectedly ran into this problem of pythonnet not supporting python 3.14, so i'm running into this problem too, (runtime error while trying to run a python script that is using pythonnet), i wonder how long it takes to update it for python 3.14 considering its release-candidates and pre-releases have been out for a while
Reacted by GChristensen, mashamellow, IB_U_Z_Z_A_R_Dl and Houbein@filmor I'm unfortunately not in a position to help directly - but if this is a situation that can be fixed by throwing money at someone who does have the skills to investigate the problem, I might be able to help. If that's the case, let me know.
- marked Pythonnet does install on the new Python 3.14.0 yet #2626 as a duplicate of this issue
on Oct 8, 2025 Any update on this? Ran into the same issue while installing awsebcli
- pinned this issue
on Feb 25, 2026 3.1.0rc0 is out now with the Python 3.14 support merged. Please test and report back. I still have not found time to fix the CI completely, which is a prerequisite for me to cut this as a full release.
Reacted by porly1985, Victor, Russell Keith-Magee and PythonPanReacted by Stef Smeets15 remaining items
I guess I will have to be patient and somehow circumvent the missing release for now, thanks for the answer
@MischaPanch You can take a crack at fixing the two failing tests, if you have time.
The failing unit test blocking 3.14 is
test_getting_overloaded_method_binding_does_not_leak_memory, here .def test_getting_overloaded_method_binding_does_not_leak_memory(): """Test that managed object is freed after calling overloaded method. Issue #691""" from PlainOldNamespace import PlainOldClass import psutil, os, gc, clr process = psutil.Process(os.getpid()) processBytesBeforeCall = process.memory_info().rss print("\n\nMemory consumption (bytes) at start of test: " + str(processBytesBeforeCall)) iterations = 500 for i in range(iterations): PlainOldClass().OverloadedMethod.Overloads[int] gc.collect() System.GC.Collect() processBytesAfterCall = process.memory_info().rss print("Memory consumption (bytes) at end of test: " + str(processBytesAfterCall)) processBytesDelta = processBytesAfterCall - processBytesBeforeCall print("Memory delta: " + str(processBytesDelta)) bytesAllocatedPerIteration = pow(2, 20) # 1MB bytesLeakedPerIteration = processBytesDelta / iterations # Allow 50% threshold - this shows the original issue is fixed, which leaks the full allocated bytes per iteration failThresholdBytesLeakedPerIteration = bytesAllocatedPerIteration / 2 > assert bytesLeakedPerIteration < failThresholdBytesLeakedPerIteration E assert 903208.96 < 524288.0 tests\test_method.py:1015: AssertionError ---------------------------- Captured stdout call ----------------------------- Memory consumption (bytes) at start of test: 163160064 Memory consumption (bytes) at end of test: 614764544 Memory delta: 451604480 =========================== short test summary info =========================== FAILED tests/test_method.py::test_getting_overloaded_method_binding_does_not_leak_memory - assert 903208.96 < 524288.0 ============= 1 failed, 465 passed, 5 skipped, 1 xpassed in 5.02s =============
Additionally, the mono tests fail with an internal error here,
Determining projects to restore... All projects are up-to-date for restore. Python.Runtime -> /Users/runner/work/pythonnet/pythonnet/pythonnet/runtime/Python.Runtime.dll Python.Test -> /Users/runner/work/pythonnet/pythonnet/src/testing/bin/Debug/netstandard2.0/Python.Test.dll Python.Test -> /var/folders/t5/f77_gwnj6p95qxy9py3fckx00000gn/T/tmpe58flof0/ INTERNALERROR> Traceback (most recent call last): INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/pythonnet/__init__.py", line 75, in _create_runtime_from_spec INTERNALERROR> return clr_loader.get_mono(**params) INTERNALERROR> ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/clr_loader/__init__.py", line 78, in get_mono INTERNALERROR> impl = Mono( INTERNALERROR> # domain=domain, INTERNALERROR> ...<7 lines>... INTERNALERROR> set_signal_chaining=set_signal_chaining, INTERNALERROR> ) INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/clr_loader/mono.py", line 36, in __init__ INTERNALERROR> self._version: str = initialize( INTERNALERROR> ~~~~~~~~~~^ INTERNALERROR> config_file=optional_path_as_string(config_file), INTERNALERROR> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ INTERNALERROR> ...<8 lines>... INTERNALERROR> trace_level=trace_level, INTERNALERROR> ^^^^^^^^^^^^^^^^^^^^^^^^ INTERNALERROR> ) INTERNALERROR> ^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/clr_loader/mono.py", line 146, in initialize INTERNALERROR> _MONO = load_mono(libmono) INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/clr_loader/ffi/__init__.py", line 49, in load_mono INTERNALERROR> return ffi.dlopen(path_str, ffi.RTLD_GLOBAL) INTERNALERROR> ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/cffi/api.py", line 150, in dlopen INTERNALERROR> lib, function_cache = _make_ffi_library(self, name, flags) INTERNALERROR> ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/cffi/api.py", line 834, in _make_ffi_library INTERNALERROR> backendlib = _load_backend_lib(backend, libname, flags) INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/cffi/api.py", line 829, in _load_backend_lib INTERNALERROR> raise OSError(msg) INTERNALERROR> OSError: cannot load library '/Library/Frameworks/Mono.framework/Versions/Current/lib/libmonosgen-2.0.dylib': dlopen(/Library/Frameworks/Mono.framework/Versions/Current/lib/libmonosgen-2.0.dylib, 0x000A): tried: '/Library/Frameworks/Mono.framework/Versions/Current/lib/libmonosgen-2.0.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Library/Frameworks/Mono.framework/Versions/Current/lib/libmonosgen-2.0.dylib' (no such file), '/Library/Frameworks/Mono.framework/Versions/Current/lib/libmonosgen-2.0.dylib' (no such file). Additionally, ctypes.util.find_library() did not manage to locate a library called '/Library/Frameworks/Mono.framework/Versions/Current/lib/libmonosgen-2.0.dylib' INTERNALERROR> INTERNALERROR> The above exception was the direct cause of the following exception: INTERNALERROR> INTERNALERROR> Traceback (most recent call last): INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/_pytest/main.py", line 314, in wrap_session INTERNALERROR> config._do_configure() INTERNALERROR> ~~~~~~~~~~~~~~~~~~~~^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/_pytest/config/__init__.py", line 1159, in _do_configure INTERNALERROR> self.hook.pytest_configure.call_historic(kwargs=dict(config=self)) INTERNALERROR> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/pluggy/_hooks.py", line 534, in call_historic INTERNALERROR> res = self._hookexec(self.name, self._hookimpls.copy(), kwargs, False) INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/pluggy/_manager.py", line 120, in _hookexec INTERNALERROR> return self._inner_hookexec(hook_name, methods, kwargs, firstresult) INTERNALERROR> ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 167, in _multicall INTERNALERROR> raise exception INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/.venv/lib/python3.14/site-packages/pluggy/_callers.py", line 121, in _multicall INTERNALERROR> res = hook_impl.function(*args) INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/tests/conftest.py", line 87, in pytest_configure INTERNALERROR> import clr INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/clr.py", line 6, in <module> INTERNALERROR> load() INTERNALERROR> ~~~~^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/pythonnet/__init__.py", line 133, in load INTERNALERROR> set_runtime_from_env() INTERNALERROR> ~~~~~~~~~~~~~~~~~~~~^^ INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/pythonnet/__init__.py", line 114, in set_runtime_from_env INTERNALERROR> runtime = _create_runtime_from_spec(spec) INTERNALERROR> File "/Users/runner/work/pythonnet/pythonnet/pythonnet/__init__.py", line 90, in _create_runtime_from_spec INTERNALERROR> raise RuntimeError( INTERNALERROR> ...<2 lines>... INTERNALERROR> ) from exc INTERNALERROR> RuntimeError: Failed to create a .NET runtime (mono) using the INTERNALERROR> parameters {}.
- marked while installing pythonnet,i met the bug! #2704 as a duplicate of this issue
on Apr 12, 2026 @filmor Do you think that CI failure (
test_getting_overloaded_method_binding_does_not_leak_memory) is a genuine memory leak?https://github.com/pythonnet/pythonnet/releases/tag/v3.1.0-rc1 is hopefully the final release candidate. Please test it thoroughly. I will ensure that the changelog is up to date and release it as 3.1.0 next weekend, provided no blockers appear in the meantime.
Reacted by Sebastian Fischer, ghaarsma and pepsibanditReacted by Stef Smeets and pepsibandit@filmor I've done another pass of testing with 3.1.0rc1 with Toga's test suite, and didn't spot any problems.
Reacted by Benedikt Reinartz, heartacker and Scott Madeux- unpinned this issue
on May 23, 2026
Python.net's
requires-pythonplaces a hard upper pin on<3.14.Python 3.14 is nearing release; RC1 is out, which indicates that ABI stability now exists.
It would be desirable for Python.net to support the upcoming Python release.