AWS CLI v1 Maintenance Mode: How to Upgrade Before July 15, 2026

AWS CLI v1 enters maintenance mode on July 15, 2026 and reaches end of support on July 15, 2027. AWS said scripts and workflows made for CLI v1 should continue working during the maintenance window, but there is one line platform teams should pay attention to: after maintenance starts, CLI v1 will not receive API updates for new services, existing service changes, or new regions.

That means the upgrade pressure is less about today’s scripts breaking tomorrow and more about tomorrow’s AWS features never arriving in the old CLI.

What changes on July 15, 2026

That maintenance row is the one that matters operationally. If your automation needs newly launched AWS services, new regions, or updated APIs for evolving services, CLI v1 becomes a liability long before end of support arrives.

Why teams should move earlier than the deadline

Because migrations are easier when they are boring.

If you wait until a new service launch or API change exposes the gap, the upgrade suddenly happens under pressure. That is exactly the wrong time to discover a parsing assumption or output-format quirk in an old script.

The teams that should move first are easy to identify:

• platform teams maintaining shared build images
• CI/CD systems with lots of AWS automation
• teams adopting new AWS services frequently
• shops running mixed laptop and runner environments where version drift already exists

If any of that sounds familiar, treat July 15, 2026 as the latest comfortable date, not the ideal date.

What usually breaks in CLI migrations

The CLI binary upgrade itself is not the hard part. The hard part is the invisible assumptions that accumulated around it:

• parsing text output instead of structured JSON
• relying on exact field formatting
• local install scripts that still fetch v1 packages
• old container images pinned to v1

This is why I would audit automation before I would mass-upgrade developer laptops.

A practical migration order

1. Find every place CLI v1 still exists

Do not start with human machines. Start with automation:

• CI runners
• container build images
• deployment containers
• shell scripts in shared repos

Those are the places where stale CLI versions quietly survive the longest.

2. Upgrade shared environments first

If you fix the base runner and builder images, many teams inherit the migration automatically. That gives you the biggest leverage with the least coordination overhead.

3. Use AWS’s migration helpers

AWS calls out two useful tools in the maintenance-mode announcement:

• upgrade debug mode in CLI v1 to highlight changed behavior
• the CLI v1-to-v2 migration tool for linting and script upgrades

Use them. Manual diffing across a large script estate is a waste of time if AWS already shipped tooling to surface common issues.

4. Test the flows that matter, not just aws --version

A version check proves nothing. Test the workflows that actually make your money:

• login and profile handling
• CI deployment steps
• artifact publishing
• IAM and identity workflows

If your environment relies heavily on modern identity, this is also a good time to tighten AWS IAM Identity Center usage rather than carrying older credential habits forward.

Where CLI v2 is clearly better

AWS keeps highlighting the same benefits:

• embedded Python, so it does not depend on your system Python
• improved interactive features
• better identity and login ergonomics
• ongoing support for new AWS services and updates

That first point is a bigger deal than it sounds. A lot of old CLI pain was really packaging pain in disguise.

How this affects CI/CD teams

CI/CD should be the first migration wave because that is where unsupported CLI versions become fleet-wide risk. If your deployment path depends on GitHub Actions or GitLab runners, update the shared images and scripts now, then validate the workflows.

Relevant adjacent reads here are GitHub Actions Deploy to AWS and GitLab CI/CD + Terraform. The common thread is the same: do not let shared pipeline infrastructure lag behind the platform it is supposed to automate.

My recommendation

Upgrade to AWS CLI v2 well before July 15, 2026 if your team depends on current AWS features or shared automation. Use the maintenance window as cleanup time, not as permission to wait.

CLI migrations are usually easy right up until they are not. The right move is to do this while it is still a routine maintenance task rather than a blocking incident.