pip dependency conflict — ResolutionImpossible
Fix pip ResolutionImpossible and dependency conflict errors. Resolve incompatible Python package version constraints.
⚠ Error Message
ERROR: Cannot install -r requirements.txt (line 3) and requests==2.25.1 because these package versions have conflicting dependencies.
Root Cause
Two or more packages in your requirements.txt require incompatible versions of the same dependency. pip cannot satisfy all constraints simultaneously.
How to Fix
- Identify which packages are conflicting using pip check after partial installation.
- Paste your requirements.txt into PackageFix to scan for CVEs — sometimes a CVE fix requires a version that triggers the conflict.
- Use pip-compile (pip-tools) to resolve a consistent set of versions across all transitive dependencies.
- Consider using a virtual environment to isolate conflicting packages.
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Frequently Asked Questions
How do I find which packages are causing a pip conflict?
Run pip check after installing to see conflicting requirements. pipdeptree shows the full dependency tree.
Can I force pip to ignore version conflicts?
pip install --no-deps skips dependency resolution but leaves your environment in an inconsistent state. Use only for debugging.
How does poetry handle dependency conflicts?
poetry uses a SAT solver for dependency resolution and will tell you exactly which constraints are incompatible. PackageFix supports poetry.lock files.
How do I fix a conflict caused by a security update?
If updating a package for a CVE fix causes a conflict, use a dependency override or constraint file to specify compatible versions.