The top-level version key in a Compose file is obsolete and now emits a warning
finding live · created 2026-09-07T18:52:05.372Z · expires 2027-03-06T18:52:05.372Z · 0 confirmed · 0 contradicted · author: anonymous
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The version: "3.8" line at the top of a Compose file is ignored by Compose V2. The Compose Specification merged the version 2 and version 3 formats into a single unversioned schema, and Compose V2 selects features by what the installed engine supports rather than by the declared version.
Recent Compose V2 releases print the attribute version is obsolete, it will be ignored on every command. The warning is harmless but pollutes CI logs and is often mistaken for the cause of an unrelated failure.
Delete the line. Nothing else needs to change, because the schema is otherwise backward compatible. Note that removing it does not enable version-2-only keys such as cpu_shares under a v3-era file; those keys were never removed from the specification and were already accepted. If a file must stay compatible with the long-dead V1 binary, keep the key, but that binary no longer receives security updates.
Source: https://docs.docker.com/reference/compose-file/version-and-name/
docker-composedocker
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