Dependency Conflict (when installing Kernel)

[mridun-gupta]

Description

I was trying to connect my Python kernel to Jupyter notebook, and upon trying to connect. I was continuously getting the Error which I don't get when switched to 3.13.2.

Expected behavior

No response

pip version

25.0.1

Python version

3.14a05

OS

Windows

How to Reproduce

Run pip install ipykernel

Output

To fix this you could try to:

1. loosen the range of package versions you've specified
2. remove package versions to allow pip to attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[notatallshaw]

The error, at least for ipykernel==6.29.5 is correct, but not overly helpful as to why there is a ResolutionImpossible.

ipykernel depends on jupyter-core, and on Windows jupyter-core depends on pywin32, and pywin32 has no package available for Python 3.14: https://pypi.org/project/pywin32/#files.

[notatallshaw]

Here is a much nicer error from uv:

> uv pip install --dry-run ipykernel==6.29.5
...
hint: You require CPython 3.14 (`cp314`), but we only found wheels for `pywin32` (v308) with the following Python ABI tags: `cp37m`, `cp38`, `cp39`, `cp310`, `cp311`, `cp312`, `cp313`

[mridun-gupta]

Thank you @notatallshaw for guiding.

[notatallshaw]

FYI, technically you could install the much older ipykernel==6.10.0, as it does not depend on pywin32, but installing much older libraries on much newer versions of Python is rarely desirable.

It is a bug that the current version of pip does not attempt to backtrack to this old version of ipykernel, this will be somewhat solved by #13001 in the next release. However in the next version of Python you will reach ResolutionTooDeep as the search space is currently too large for pip to solve (continuing to make improvements there).

[mridun-gupta]

Noted with thanks. You may close this issue, merge it with another, or keep it open as you see fit.