actions / actions/cache

"Cache entry deserialization failed, entry ignored" for Python Action

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Description

I'm using "actions/cache@v5" and I get the error:

WARNING: Cache entry deserialization failed, entry ignored

on the step of importing a Python requirements.txt file.

running on: ubuntu-latest
python-version: 3.14

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Research direction

Start by reproducing the warning from .github/workflows/python_run_script.yml on ubuntu-latest with Python 3.14 and actions/cache@v5. Trace the requirements.txt cache step to determine why deserialization fails; done means the workflow imports the requirements cache without the warning and ignored entry.

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Assessment

Tech stack
github-actions, python
Domain
ci-cd
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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