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pip cannot resolve conflicting dependency requirements

ResolutionImpossible

pip could not find a dependency set that satisfies all of the requested packages and their version constraints.

ResolutionImpossiblepackage managers

Observed message

ResolutionImpossible

Why it happens

  • Two or more requested packages require incompatible versions of the same dependency.
  • Pinned package versions leave pip with no valid resolution path.
  • A dependency conflict exists even though the direct install targets look individually valid.

How to fix it

  1. Relax pinned versions where possible and let pip choose a compatible combination.
  2. Inspect the dependency tree to identify which packages are constraining the same dependency in incompatible ways.
  3. Choose alternate package versions or replace one of the conflicting packages if no compatible set exists.

Official reference

pip documentation: Example error ResolutionImpossible

Related errors

No matching distribution foundpip cannot find a compatible package versionrequires <package>, which is not installedpip check found a missing required packagerequires WebOb, which is not installedpip check found a required package that is not installedhas requirement X, but you have Ypip check found an installed dependency with the wrong version

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pip ResolutionImpossible: causes and fixes | Error Atlas