ST-2026-092 · SDKs, clients & toolchains
AWS CLI v1 enters maintenance mode
AWS CLI v1 entered maintenance mode on 5 August 2026; it now receives only critical bug and security fixes, while new-service, API-update and new-region support has ended. End of support remains 15 July 2027.
Previous state
Through 4 August 2026, AWS CLI v1 remained in General Availability, with regular releases that included new-service support, API updates for existing services, and bug and security fixes.
Current state
AWS CLI v1 entered maintenance mode on 5 August 2026. During maintenance, AWS limits releases to critical bug fixes and security issues, does not provide API updates for new or existing services, and does not add support for new regions. AWS lists 15 July 2027 as end of support.
Affected users
Who needs to care
AWS CLI v1 installations and the scripts, CI/CD jobs, automation, and shared Python environments that depend on ongoing new-service/API/region coverage or on the CLI-bundled botocore and s3transfer dependency behaviour.
Required response
What to do
Migrate supported workflows to AWS CLI v2; test scripts with AWS's v1-to-v2 migration guidance or tooling, and where other applications share the Python environment, explicitly manage botocore or s3transfer versions rather than relying on the copies bundled with CLI v1.
Evidence boundary
What the source does not prove
AWS's 15 January announcement and 10 June dependency post scheduled maintenance mode for 15 July 2026. AWS's official aws/aws-cli announcement on 6 August records the actual transition on 5 August 2026 and General Availability through 4 August. The cited first-party sources do not state why the transition date moved; they retain 15 July 2027 as end of support and state that existing v1 scripts and workflows can continue working during maintenance unless an AWS service makes fundamental changes.
Lifecycle history
Dated event sequence
- Maintenance lifecycle announced
AWS announced that CLI v1 was planned to enter maintenance mode on 15 July 2026 and reach end of support on 15 July 2027.
- Maintenance dependency changes explained
AWS described the maintenance-mode botocore and s3transfer bundling changes and still referred to a 15 July 2026 maintenance start.
- AWS CLI v1 entered maintenance mode
AWS's official aws/aws-cli announcement records General Availability through 4 August 2026 and maintenance mode beginning 5 August 2026.
- AWS CLI v1 end of support
AWS states that CLI v1 will receive no further updates or releases after 14 July 2027; previously published releases will remain available.
Evidence ledger
First-party sources
- 01Amazon Web Services — CLI v1 Maintenance Mode Announcement
Official AWS Developer Tools Blog · 2026-01-15
Open official source ↗ - 02Amazon Web Services — AWS CLI v1 maintenance mode: announcing changes to dependency updates
Official AWS Developer Tools Blog · 2026-06-10
Open official source ↗ - 03Amazon Web Services — AWS CLI v1 is now in maintenance mode
Official aws/aws-cli repository announcement · 2026-08-06
Open official source ↗