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[FEEDBACK REQUEST] Python 3.15 preview #216
Description
Today, we have published the preview AWS Lambda Python 3.15 runtime. You can use it to build and deploy Python 3.15 Lambda functions in both deployment formats:
- Managed runtime (ZIP): select the
python3.15runtime when deploying your function code as a.ziparchive. - Container image (OCI): build and deploy your function using the preview base image
public.ecr.aws/lambda/python:3.15-preview.
Please share any feedback below! Thank you!
Activity
erpel commentedon Aug 4, 2026
Is there a chance that images without -preview were already pushed to the registry around July 8th?
I have seen a dependency update bot update a Dockerfile to use
FROM public.ecr.aws/lambda/python:3.15and that image seems to have disappeared again.The image disappearing would match the fact that 3.15 is not officially out yet. Can you help explain how it existed for a timeframe between July 8th and July 22nd?
Besides being built, the image has not run yet, so I can't provide actual feedback.
maxday commentedon Aug 4, 2026
Thanks @erpel for reaching out! You're right, during our build/testing process we did incorrectly push non-preview
3.15tags topublic.ecr.aws/lambda/python, which is whyFROM public.ecr.aws/lambda/python:3.15resolved for a while and then went away.That tag shouldn't have been published yet, and we're sorry for the inconvenience this caused with your dependency update bot.
For now, please keep using
public.ecr.aws/lambda/python:3.15-preview(still experimental, not for production use). We will eventually publish the3.15tags once the runtime is no longer in preview.