ST-2026-211 · Runtime, protocol & platform support
Cloudflare Workers updates its V8 runtime to 15.2
Cloudflare's Workers platform changelog records an update to V8 version 15.2 on 18 August 2026, following V8 15.1 on 16 July and V8 15.0 on 4 June.
Previous state
Cloudflare Workers used the prior documented V8 runtime version 15.1.
Current state
The Cloudflare Workers runtime changelog records V8 version 15.2 as the current documented runtime update.
Affected users
Who needs to care
Applications executing JavaScript and WebAssembly on the Cloudflare Workers runtime.
Required response
What to do
Run compatibility-sensitive test suites where application behavior depends on V8 engine semantics, but do not infer undocumented breaking changes from the version update alone.
Evidence boundary
What the source does not prove
Cloudflare's runtime changelog states only that V8 was updated to version 15.2. It does not enumerate every upstream V8 change, establish a customer migration deadline, or prove a breaking change for any specific Worker.
Lifecycle history
Dated event sequence
- Workers runtime updates to V8 15.2
Cloudflare recorded the V8 15.2 runtime update in the Workers platform changelog.
Evidence ledger
First-party sources
- 01Cloudflare — Workers Changelog
Official Cloudflare Workers platform changelog · 2026-08-18
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