Hey folks 👋

I'm Harsh from the LocalStack team. Wanted to flag an upcoming change that will directly affect users of the LocalStack module in this library.

What's changing: Starting March 23, 2026, localstack/localstack:latest on Docker Hub will consolidate into a single unified image that requires authentication via a LOCALSTACK_AUTH_TOKEN. The free Community image, as it exists today, will no longer be available under that tag without an auth token set.

What this means for this repo:

The LocalStackContainer in modules/localstack pulls localstack/localstack by default to spin up the container during tests. Any user who instantiates LocalStackContainer after March 23 without a LOCALSTACK_AUTH_TOKEN set will hit an authentication error and their tests will fail immediately.

The places most likely to need updating:

• The LocalStack module docs and any related examples in modules/localstack, which don't currently mention auth token setup as a prerequisite
• The LocalStackContainer class itself, where passing LOCALSTACK_AUTH_TOKEN as an environment variable should be documented or facilitated
• The CI/CD pipeline (.github/workflows/ci-community.yml) if it runs LocalStack-based tests without an auth token

What users will need to do:

1. Sign up for a free LocalStack account at [localstack.cloud](https://localstack.cloud/)
2. Generate an auth token from the LocalStack Web App
3. Set LOCALSTACK_AUTH_TOKEN as an environment variable when starting the container

With testcontainers-python, this would look like:

import os
from testcontainers.localstack import LocalStackContainer
with LocalStackContainer() \
 .with_env("LOCALSTACK_AUTH_TOKEN", os.environ.get("LOCALSTACK_AUTH_TOKEN", "")) as localstack:
 # your test code here
 pass

The good news: A free tier is staying — no one has to pay. CI credits are now unlimited on all plans, including free, and open-source projects like this one can apply for free access to paid plans.

Full details in our announcements:

• https://blog.localstack.cloud/the-road-ahead-for-localstack/
• https://blog.localstack.cloud/localstack-single-image-next-steps/
• https://blog.localstack.cloud/2026-upcoming-pricing-changes/

Happy to help with any doc updates, review PRs, or answer questions. Let us know if there's anything we can do to make this easier — and thanks for maintaining the LocalStack module for the Python community! 🙏