diff --git a/.github/workflows/update-release.yml b/.github/workflows/update-release.yml
index cfd5379..80771e5 100644
--- a/.github/workflows/update-release.yml
+++ b/.github/workflows/update-release.yml
@@ -20,7 +20,7 @@
 #      bundle and schema to the draft (draft-first because published
 #      releases freeze their assets),
 #   4. confirms origin's refs and the draft's assets before the managed
-#      publish stage attests every asset (attestation.jsonl; public
+#      publish stage attests every asset (attestation.json; public
 #      repositories only, by fleet policy) and flips the release live.
 #      When the draft is published, GitHub binds it to the existing
 #      vX.Y.Z tag, so the release lands on the packaged commit.
@@ -38,7 +38,7 @@
 # Finish a dead run by re-running its FAILED jobs. The same steps by hand
 # (<merge sha> is the draft release's target commitish; a hand-packaged
 # commit carries no workflow-run trailer, and a hand-finished release no
-# attestation.jsonl - both need the workflow's identity):
+# attestation.json - both need the workflow's identity):
 #   git checkout <merge sha>
 #   bun install --frozen-lockfile --ignore-scripts && bun run build
 #   TAG=vX.Y.Z GITHUB_SHA=<merge sha> bun .github/scripts/release-pipeline.ts package
@@ -159,16 +159,21 @@ jobs:
         run: GITHUB_SHA="$SOURCE_SHA" bun .github/scripts/release-pipeline.ts verify
       # Publishing freezes the asset list, so an incomplete one must stop
       # the pipeline here, while the release is still a draft (v2.0.0
-      # shipped assetless exactly this way). attestation.jsonl is the
-      # managed publish stage's asset: attached after this job, replaced on
-      # its reruns - ignore it rather than racing it.
+      # shipped assetless exactly this way). attestation.json is the managed
+      # publish stage's asset, attached after this job and replaced on its
+      # reruns, so the check ignores it. A legacy attestation.jsonl (the
+      # name before the template renamed it) is stale provenance that stage
+      # no longer cleans up, so it is deleted here before the check.
       - name: Confirm the release carries both packaged assets
         env:
           GH_TOKEN: ${{ github.token }}
           TAG: ${{ inputs.tag }}
         run: |
+          if gh release view "$TAG" --json assets --jq '.assets[].name' | grep -qx 'attestation.jsonl'; then
+            gh release delete-asset "$TAG" attestation.jsonl --yes
+          fi
           assets="$(gh release view "$TAG" --json assets \
-            --jq '[.assets[].name | select(. != "attestation.jsonl")] | sort | join(" ")')"
+            --jq '[.assets[].name | select(. != "attestation.json")] | sort | join(" ")')"
           expected="index.js settings.schema.json"
           if [ "$assets" != "$expected" ]; then
             echo "::error::release $TAG carries assets [$assets], expected [$expected]; re-run package-release before anything publishes."
diff --git a/SECURITY.md b/SECURITY.md
index 9d07641..94ad024 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -31,7 +31,7 @@ This action holds a repository-admin token and writes repository settings, so th
 - Settings escalation. A crafted settings file should never be able to touch a repository or setting it does not declare, nor bypass the preflight barrier or the required-sections policy.
 - Supply chain. Every ref a `uses:` pin can name - the `vX.Y.Z` release tags and the moving major - points at a packaged commit parented on the audited release commit, produced by the release workflow run named in its provenance message; main carries no executable bundle. The release-tags ruleset freezes version tags for everything except deliberate repository-admin action (the bypass exists for repair; the release workflow itself never moves a version tag, reruns verify the existing one byte-for-byte instead). A packaged commit whose bundle a rebuild of its parent's src/ does not reproduce is a vulnerability. The release pipeline also attests every release asset (`lib/index.js` and `lib/settings.schema.json`) in one build-provenance attestation while the repository is public (GitHub offers no attestations elsewhere): fetch either from the `vX.Y.Z` tag or the release assets, then check it with `gh attestation verify
   <artifact> -R vivswan/github-settings-as-code` (add
-  `--signer-workflow vivswan/github-settings-as-code/.github/workflows/release.yml` to also pin the producing workflow), or without the attestations API via `--bundle` against the `attestation.jsonl` release asset. A release finished by hand carries no attestation at all, and its packaged commit no workflow-run trailer: both need the workflow's OIDC identity.
+  `--signer-workflow vivswan/github-settings-as-code/.github/workflows/release.yml` to also pin the producing workflow), or without the attestations API via `--bundle` against the `attestation.json` release asset. A release finished by hand carries no attestation at all, and its packaged commit no workflow-run trailer: both need the workflow's OIDC identity.
 
 Fixes ship in the next release and are not backported; upgrade the `uses:` pin to pick them up.