ST-2026-178 · Enforcement & amendments
Google Ads API v21 sunsets and requests begin failing
Google Ads API v21 reached sunset on 5 August 2026; from that date all v21 API requests begin to fail, while integrations can move to a newer supported version.
Previous state
Before the sunset boundary, integrations could continue sending requests to Google Ads API v21 while planning migration to a newer API version.
Current state
From 5 August 2026, Google Ads API v21 is sunset and v21 requests begin to fail; callers must use a newer supported API version for continued access.
Affected users
Who needs to care
Developers, automation and integrations that still send requests to Google Ads API v21.
Required response
What to do
Identify any remaining v21 request paths, migrate them to a newer supported Google Ads API version, and verify production traffic no longer depends on v21.
Evidence boundary
What the source does not prove
Google's notice applies specifically to Google Ads API v21. It does not retire Google Ads API as a product, and later supported API versions remain outside this event.
Lifecycle history
Dated event sequence
- v21 sunset reminder published
Google published the version-specific reminder directing v21 callers to migrate to a newer version before the enforcement date.
- v21 sunsets
Google states that all v21 API requests begin to fail from this date.
Evidence ledger
First-party sources
- 01Google Ads Developer Blog — Google Ads API v21 sunset reminder
Official Google Ads API version-sunset and enforcement notice · 2026-06-25
Open official source ↗