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Announcement: AWS SAM CLI dropping Python 3.9 support on March 19, 2026 #8692
Description
Starting March 19, 2026, AWS SAM CLI will no longer support Python 3.9 as a runtime for running SAM CLI itself.
Why?
Python 3.9 reached end-of-life on October 5, 2025. Since then, an increasing number of SAM CLI's dependencies have dropped Python 3.9 support, requiring us to maintain version-conditional pins across many packages. Continuing to support Python 3.9 adds significant maintenance burden and limits our ability to adopt newer dependency versions.
What does this mean for you?
- If you are running SAM CLI installed from SAM CLI installer, no action is needed.
- If you are running SAM CLI with Python 3.10 or later, no action is needed.
- If you are running SAM CLI with Python 3.9, please upgrade to Python 3.10+ before March 19, 2026.
- This change only affects the Python version used to run SAM CLI. SAM CLI will continue to support building and invoking Lambda functions that use the `python3.9` Lambda runtime.
Timeline
| Date | Action |
|---|---|
| Feb 25, 2026 | Announcement |
| March 19, 2026 | Python 3.9 support removed from SAM CLI |
Recommended action
Upgrade to Python 3.11 or later for the best experience. You can check your current Python version with:
python --version
# or
sam --infoIf you have questions or concerns, please comment on this issue.
Activity
chore: migrate dependencies to pyproject.toml and drop Python 3.9 sup…
chore: migrate dependencies to pyproject.toml and drop Python 3.9 sup…
github-actions commentedon Mar 9, 2026
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roger-zhangg commentedon Mar 19, 2026
Released: https://github.com/aws/aws-sam-cli/releases/tag/v1.156.0
github-actions commentedon Mar 19, 2026
Comments on closed issues are hard for our team to see.
If you need more assistance, please either tag a team member or open a new issue that references this one.
If you wish to keep having a conversation with other community members under this issue feel free to do so.