Flask 2.1+Python 3.11

Why?

Why is Flask 2.1 compatible with Python 3.11?

Requirement

Python >=3.7

Selected version

Python 3.11

Evaluation

3.11.16 satisfies >=3.7

Conclusion

COMPATIBLE

Evidence

CompatHub reports compatibility from upstream sources rather than making unsupported claims of its own.

• PyPI JSON API

  Confidence: HIGH

  https://pypi.org/pypi/Flask/2.1.3/json

  Retrieved 30 August 2026

  Requirement: >=3.7

Python versions

Compatibility is derived from the project's declared Python requirement (>=3.7); it does not mean every version combination has been independently tested.

• 3.6❌
• 3.7✓
• 3.8✓
• 3.9✓
• 3.10✓
• 3.11✓
• 3.12✓
• 3.13✓
• 3.14✓
• 3.15✓
• 3.16✓

Other Python versions satisfying this requirement

Flask 2.1 — compatible Python lines tracked in CompatHub

• ✓Python 3.7version lineEOL
• ✓Python 3.8version lineEOL
• ✓Python 3.9version lineEOL
• ✓Python 3.10version linesupported
• ✓Python 3.11version linesupported
• ✓Python 3.12version linesupported
• ✓Python 3.13version linesupported
• ✓Python 3.14version linesupported
• ✓Python 3.15version line
• ✓Python 3.16version line

Other Flask versions

Only lines with relevant compatibility evidence are listed.

• Flask 3.1
• Flask 3.0
• Flask 2.3
• Flask 2.2
• Flask 2.1
• Flask 2.0
• Flask 1.1
• Flask 1.0

Lifecycle context

Lifecycle status is separate from compatibility. An EOL component can still satisfy a documented version requirement.

Supported alternatives

Python lines that satisfy this requirement and are still supported.

• Python 3.10supported
• Python 3.11supported
• Python 3.12supported
• Python 3.13supported
• Python 3.14supported