Xcode version mismatch error "this version of Xcode is not supported" for submission

TL;DR

Submit with an Xcode version Apple currently accepts for uploads: upgrade Xcode to a supported release, or if the error is premature, wait for Apples staged acceptance after a new Xcode launch and rebuild the archive with the accepted version. Apple requires apps to be built with a minimum Xcode and SDK level and rejects archives from unsupported versions at upload. Rebuilding with the same code under the supported Xcode is sufficient; no project changes are normally needed.

this version of Xcode is not supported - submission error

Use this when

• Upload validation says this version of Xcode is not supported.
• You archive on an older macOS machine kept for stability.
• A brand new Xcode just released and acceptance has not opened yet.

Not for this skill when

• The project fails to compile under the new Xcode. That is a migration task after the version question is settled.
• You use a beta Xcode for a production submission. Beta builds are never accepted for the store; use the release version.

Steps

1. Read Apples current submission requirements page for the minimum Xcode and SDK versions in force. Verify: the required minimum version is recorded with its effective date
2. Check the Xcode version that produced the archive from the build logs or the archives info. Verify: the archives Xcode version is known exactly
3. Install the required Xcode release alongside the old one if needed, keeping the old version for other projects. Verify: the supported Xcode is installed and selectable
4. Select the new Xcode for command line tools and rebuild the archive from the same source. Verify: the new archive reports the supported Xcode version
5. Upload the rebuilt archive and watch validation pass the version gate. Verify: the build reaches processing with no version rejection
6. Record the Xcode version in the release checklist so future releases start from a known-good toolchain. Verify: the checklist entry exists for the next release
7. Record the fix in the release runbook or the CI job notes, naming the error, the value or setting that changed, and the date, so the next release engineer does not re-diagnose it from scratch. Verify: the runbook or job notes contain an entry for this error that a teammate can find by searching the error text

Why it happens

Apple ties store acceptance to toolchain versions so submitted apps are built against current SDKs with current security and privacy enforcement. The gate is checked from metadata baked into the archive, so no amount of re-uploading an old archive helps. Teams with pinned build machines feel this most: the pin that guaranteed stability becomes the blocker at submission.

In practice this failure is rarely a one-off. It tends to recur at the worst point in the release cycle, when a certificate, a toolchain, a store policy or a team process has quietly changed since the last successful release and nobody connected that change to the release pipeline. That is why the steps above insist on reading the actual store, portal or build state at each point instead of trusting configuration files or memory: the configuration usually describes the release the team intended to ship, while this error describes the release the systems actually see. Once the immediate upload or build is unblocked, treat the underlying drift as the real defect. Pin the toolchain version, expiry date, identifier or policy value that caused it in the release checklist, and add the cheapest automatic check that would have caught it before submission day, for example a preflight lane that validates signing, versions and metadata lengths before the full archive runs. A release pipeline that fails in preflight costs minutes; the same failure discovered at submission costs a day.

Variants and edge cases

Xcode version not supported App Store submission fix

Direct phrasing; rebuild under the accepted Xcode. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

built with unsupported Xcode ITMS rejection

Validation phrasing for the email version of the error. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Edge case: release candidate Xcode

An RC near a major release may upload to TestFlight but not the store. Keep a GM or release Xcode for store archives. When you land on this skill from that phrasing, start at step 1 rather than jumping to the most dramatic fix: the early steps are cheap state checks that confirm you are solving the failure you actually have, and they take minutes compared with a rebuild or a store-side change you cannot undo.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_ja9itftPMt2vAj8c-Sey4A