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pip dependency resolution went too deep

ResolutionTooDeepError

pip's dependency resolver exceeded its search depth while trying to find a compatible set of package versions, usually because the dependency graph is large or highly constrained.

ResolutionTooDeepErrorpackage managers

Observed message

ResolutionTooDeepError

Why it happens

  • The dependency graph is extremely complex and gives pip too many versions to evaluate.
  • Very broad version ranges or conflicting constraints force excessive backtracking.
  • Installed package state and requested package versions create too many possible resolution paths.

How to fix it

  1. Set reasonable lower bounds to reduce the number of old versions pip needs to consider.
  2. Use `--upgrade` where appropriate so pip can prefer newer compatible versions.
  3. Use constraint files carefully to narrow the search space without creating impossible combinations.

Official reference

pip documentation: Dependency Resolution

Related errors

No matching distribution foundpip cannot find a compatible package versionResolutionImpossiblepip cannot resolve conflicting dependency requirementsrequires <package>, which is not installedpip check found a missing required packagerequires WebOb, which is not installedpip check found a required package that is not installed

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pip ResolutionTooDeepError: causes and fixes | Error Atlas