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Python 3.11 on Lambda is deprecated June 30, 2027. Updates to these functions are blocked from August 31, 2027.[1]
Act means: change a setting or plan before the date. You can stay.
AWS Lambda Python 3.11 runtime deprecated June 30, 2027
AWS deprecates the Python 3.11 runtime (python3.11) for Lambda on June 30, 2027. After that it may get no more security patches. Creating functions is blocked from July 29, 2027, and updating them from August 31, 2027.
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Filter by runtime in the Lambda console, or list python3.11 functions with the AWS CLI in each region.
Switch to python3.12, python3.13 or python3.14. Rebuild layers and packages for it.
Test each function on the new runtime. After August 31, 2027 you cannot update a python3.11 function.
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Or add the date to your calendar: Apple or Outlook (.ics) · Google Calendar
| Deprecation date | June 30, 2027[1] |
|---|---|
| Runtime | python3.11 (Python 3.11 on Amazon Linux 2)[1] |
| Creating new functions blocked | July 29, 2027[1] |
| Updating functions blocked | August 31, 2027[1] |
| Amazon Linux 2 | End of life June 30, 2026; AWS still sends critical and selected important Amazon Linux 2 fixes for this runtime until its deprecation date[1] |
| After deprecation | AWS may stop security patches and technical support; you can still invoke your functions[1] |
| In the Lambda console | From the deprecation date you cannot create or update these functions there; the AWS CLI, AWS SAM and CloudFormation still work until the blocks[1] |
| Once updates are blocked | You cannot go back to the deprecated runtime[1] |
| How AWS tells you | Email and Health Dashboard notices at least 180 days before; Trusted Advisor lists the functions[1] |
| Can the dates change? | Yes. AWS says the dates are for planning and subject to change[1] |
| How to list them | aws lambda list-functions --function-version ALL --region us-east-1 --query "Functions[?Runtime=='python3.11'].FunctionArn" (once per region)[2] |
| Newer Python runtimes | python3.12 until October 31, 2028; python3.13 and python3.14 until June 30, 2029[1] |
| Functions on Python 3.11 | May get no security patches after June 30, 2027; no updates from August 31, 2027[1] |
In the Lambda console you can no longer create or update functions on python3.11. The AWS CLI, AWS SAM and CloudFormation still work until the blocks. Your functions keep running, but AWS may stop security patches.
python3.11 functions: aws lambda list-functions --function-version ALL --region us-east-1 --output text --query "Functions[?Runtime=='python3.11'].FunctionArn". Run it in each region.python3.12, python3.13 or python3.14. Test it before you ship.Source: [1] Lambda runtimes (Amazon Web Services) · [2] Retrieve data about Lambda Event Functions that use a deprecated runtime (Amazon Web Services)
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Time to bail on Lambda functions on Python 3.11? Act. You can stay. Python 3.11 on Lambda is deprecated June 30, 2027. Updates to these functions are blocked from August 31, 2027.
On our scale this is Act: change a setting or plan before the date. You can stay.
AWS deprecates the Python 3.11 runtime (python3.11) for Lambda on June 30, 2027. After that it may get no more security patches. Creating functions is blocked from July 29, 2027, and updating them from August 31, 2027.
Here are the facts we checked:
You can stay on AWS Lambda. You have to change a setting or plan before the date.
Leaving is a choice here, not a must.
Amazon Web Services is the main source for this page. AWS Lambda has not said more than what is listed here. If a fact is not on this page, we do not know it yet.
Functions on Python 3.11: May get no security patches after June 30, 2027; no updates from August 31, 2027.
The date to remember is June 30, 2027. Make the change before then.
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