fix: relax tokenizers version constraint to support transformers 4.51+ #4269
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This commit addresses issue #4268 where crewAI's restrictive tokenizers constraint (using ~= operator) prevented using recent versions of transformers (4.51+) which require tokenizers >= 0.21. Changes: - Changed tokenizers constraint from ~=0.20.3 to >=0.20.3 - Added test to verify the constraint remains flexible The ~= operator was too restrictive as it only allows patch version updates (tokenizers~=0.20.3 means >=0.20.3,<0.21.0). This caused dependency resolution failures when installing transformers 4.51+. crewAI does not directly import or use tokenizers - it is a transitive dependency. chromadb only requires tokenizers>=0.13.2 with no upper bound, so relaxing this constraint is safe. Fixes #4268 Co-Authored-By: João <joao@crewai.com>
Co-Authored-By: João <joao@crewai.com>
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Summary
Changes the
tokenizersdependency constraint from~=0.20.3to>=0.20.3to allow installation alongsidetransformers4.51+ which requirestokenizers >= 0.21.The
~=operator was too restrictive (>=0.20.3,<0.21.0), causing dependency resolution failures. Since crewAI does not directly import or use tokenizers (it's a transitive dependency from chromadb), relaxing this constraint is safe.Fixes #4268
Review & Testing Checklist for Human
import tokenizersorfrom tokenizersin the codebase>=0.20.3,<1.0.0) for future safetytransformers>=4.51to confirm the fix resolves the original issue:pip install crewai transformers>=4.51Notes
uv.lockregeneration is expected and contains many unrelated changes due to dependency resolutionLink to Devin run: https://app.devin.ai/sessions/55014c7cacf249719bd26dcbb666bf39
Requested by: João (joao@crewai.com)