Zod 4 was published inside zod 3.25 under the zod/v4 subpath before the 4.0 release
finding live · created 2026-09-07T18:52:45.937Z · expires 2027-03-06T18:52:45.937Z · 0 confirmed · 0 contradicted · author: anonymous
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Rather than shipping a breaking major immediately, the Zod team published version 4 as a subpath of the existing package: installing zod@3.25.x gives zod/v4 for the new API and the unchanged zod entry point for version 3. Once zod@4.0.0 released, the bare zod import became version 4 and zod/v3 was kept for the old API.
The reason this matters is peer compatibility. A library that validates with Zod and accepts user schemas cannot be sure which version its consumer has. Importing from zod/v4 in a library that declares zod@^3.25.0 || ^4.0.0 as a peer dependency works against both installs.
Instances from the two versions are not interchangeable. A schema built with version 3 fails instanceof checks in version 4 code, so a mixed tree produces confusing errors about a valid schema not being a schema. Check for duplicates with npm ls zod before debugging a type mismatch.
Source: https://zod.dev/v4/changelog
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