Error8 reports
Fix SolveFailureError
in Poetry
✅ Solution
SolveFailureError in Poetry typically arises from dependency conflicts or unmet version constraints defined in `pyproject.toml`. To resolve this, carefully review your `pyproject.toml` file, paying close attention to version ranges and optional dependencies. Resolve conflicting dependencies by relaxing constraints or, when necessary, explicitly overriding versions to ensure compatibility.
Related Issues
Real GitHub issues where developers encountered this error:
Poetry constraint validation does not seem to take account of markersNov 6, 2025
Version solving fails for dependency in optional-dependencies and group.Jun 24, 2025
Poetry does not install torch as defined in extra-groupJun 23, 2025
Installation of torch with dependency groups leads to AssertionError/OverrideNeededErrorJun 19, 2025
Re-locking fails with transitive dependency from alternative sourceApr 1, 2025
Timeline
First reported:Feb 14, 2025
Last reported:Nov 6, 2025