ST-2026-095 · SDKs, clients & toolchains
AWS Tools for PowerShell v4 reaches end of support
AWS Tools for PowerShell v4.x reached end of support on 1 June 2026 after a three-month maintenance phase; AWS directs users to v5 and keeps previously published v4 packages available.
Previous state
AWS Tools for PowerShell v4.x was fully supported through 28 February 2026, then remained in maintenance mode from 1 March through 31 May 2026 with only critical bug fixes and security updates.
Current state
Since 1 June 2026, AWS Tools for PowerShell v4.x receives no updates or releases. Previously published releases remain available through public package managers and the source code remains on GitHub.
Affected users
Who needs to care
PowerShell scripts, automation, CI/CD jobs, and administrative tooling that load AWS Tools for PowerShell v4.x packages and depend on ongoing AWS service/API coverage, bug fixes, or security updates.
Required response
What to do
Migrate supported scripts and environments to AWS Tools for PowerShell v5 using AWS's migration guide. Test the v5 breaking changes that apply to each workload, including PowerShell/runtime floors, nullable outputs, removed or renamed parameters and cmdlets, credential resolution, and changed serialization behaviour.
Evidence boundary
What the source does not prove
AWS states that existing v4 applications can continue to function unless an AWS service makes a fundamental change, but v4 receives no further releases after 1 June 2026. Previously published packages and source remain available. The evidence does not announce removal of those packages or shutdown of the underlying AWS services.
Lifecycle history
Dated event sequence
- General Availability began
AWS lists 28 July 2015 as the start of the fully supported v4 lifecycle.
- Final lifecycle dates announced
AWS announced maintenance mode from 1 March 2026 and end of support on 1 June 2026.
- Maintenance mode began
AWS limited v4.x releases to critical bug fixes and security updates and stopped adding new-service, API-update, and new-region support.
- End of support
AWS stopped all updates and releases for Tools for PowerShell v4.x while leaving previously published packages and source available.
Evidence ledger
First-party sources
- 01Amazon Web Services — AWS Tools for PowerShell v4 Maintenance Mode Announcement
Official AWS Developer Tools Blog · 2026-02-27
Open official source ↗ - 02Amazon Web Services — Migrating from AWS Tools for PowerShell version 4 to version 5
Official AWS Tools for PowerShell v5 migration guide observed 3 September 2026 · 2026-09-03
Open official source ↗