diff --git a/.github/workflows/cloudflare-main.yml b/.github/workflows/cloudflare-main.yml
index 44f00dd..613f198 100644
--- a/.github/workflows/cloudflare-main.yml
+++ b/.github/workflows/cloudflare-main.yml
@@ -76,7 +76,7 @@ jobs:
     permissions:
       contents: read
       deployments: write
-    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@3332fc8e0049b837e851778cb1fb2be1f24acb1a # v1.7.0
+    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@bdb6a6c76b0fc229fa2a54ed91c3ddf78c2ea4ec # v1.7.1
     with:
       # Under single topology the candidate and the release are the same
       # Worker, so deploying here would serve the merge immediately and there
@@ -98,7 +98,7 @@ jobs:
     permissions:
       contents: read
       deployments: write
-    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@3332fc8e0049b837e851778cb1fb2be1f24acb1a # v1.7.0
+    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@bdb6a6c76b0fc229fa2a54ed91c3ddf78c2ea4ec # v1.7.1
     with:
       operation: preview
       target: release
@@ -184,7 +184,7 @@ jobs:
     permissions:
       contents: read
       deployments: write
-    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@3332fc8e0049b837e851778cb1fb2be1f24acb1a # v1.7.0
+    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@bdb6a6c76b0fc229fa2a54ed91c3ddf78c2ea4ec # v1.7.1
     with:
       operation: deploy
       target: release
diff --git a/.github/workflows/cloudflare-pr.yml b/.github/workflows/cloudflare-pr.yml
index 1b1a2f8..21c5dc6 100644
--- a/.github/workflows/cloudflare-pr.yml
+++ b/.github/workflows/cloudflare-pr.yml
@@ -62,7 +62,7 @@ jobs:
     permissions:
       contents: read
       deployments: write
-    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@3332fc8e0049b837e851778cb1fb2be1f24acb1a # v1.7.0
+    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@bdb6a6c76b0fc229fa2a54ed91c3ddf78c2ea4ec # v1.7.1
     with:
       operation: preview
       target: candidate
diff --git a/.github/workflows/cloudflare-release.yml b/.github/workflows/cloudflare-release.yml
index 9d1b63c..63f944e 100644
--- a/.github/workflows/cloudflare-release.yml
+++ b/.github/workflows/cloudflare-release.yml
@@ -89,7 +89,7 @@ jobs:
     permissions:
       contents: read
       deployments: write
-    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@3332fc8e0049b837e851778cb1fb2be1f24acb1a # v1.7.0
+    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@bdb6a6c76b0fc229fa2a54ed91c3ddf78c2ea4ec # v1.7.1
     with:
       operation: preview
       target: release
@@ -108,7 +108,7 @@ jobs:
     permissions:
       contents: read
       deployments: write
-    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@3332fc8e0049b837e851778cb1fb2be1f24acb1a # v1.7.0
+    uses: burnt-labs/github-workflows/.github/workflows/cloudflare-version.yml@bdb6a6c76b0fc229fa2a54ed91c3ddf78c2ea4ec # v1.7.1
     with:
       operation: deploy
       target: release
diff --git a/.github/workflows/cloudflare-version.yml b/.github/workflows/cloudflare-version.yml
index b528fe7..e1c10b1 100644
--- a/.github/workflows/cloudflare-version.yml
+++ b/.github/workflows/cloudflare-version.yml
@@ -161,15 +161,19 @@ jobs:
       # available to them and GitHub is the only place they can hold a secret.
       # This carries the declared ones across.
       #
-      # Deploy only, never preview. `wrangler secret bulk` creates a Worker
-      # version and deploys it immediately, so running it on a preview would
-      # serve an intermediate version — on a chain repository that means mainnet
-      # starts serving off a job whose entire purpose is to *not* serve. A
-      # preview therefore runs against whatever secrets are already on the
-      # Worker, which is the same thing it does for bindings.
+      # Deploy only, never preview. A preview must not change what a target's
+      # secrets are, and on a chain repository the release target's secrets are
+      # mainnet's. A preview therefore runs against whatever secrets are already
+      # on the Worker, which is the same thing it does for bindings.
       #
-      # Two steps, deliberately. The first has the secrets but no Cloudflare
-      # credential and runs only jq from the runner image. The second has the
+      # This step writes the file; the deploy step below uploads it with the new
+      # version (`deploy --secrets-file`). A separate `wrangler secret` edit is
+      # deliberately not used: it edits the *latest* version and fails with
+      # Cloudflare error 10215 when that version is an undeployed upload, which
+      # is the normal state after any preview or single-topology candidate.
+      #
+      # Two steps, deliberately. This one has the secrets but no Cloudflare
+      # credential and runs only jq from the runner image. The deploy has the
       # credential but is SHA-pinned code. Neither has both a consumer-resolved
       # binary and the token.
       - name: Collect Worker secrets
@@ -193,26 +197,6 @@ jobs:
           jq -n --argjson all "$ALL_SECRETS" --argjson want "$WANTED" \
             '$want | map({key: ., value: $all[.]}) | from_entries' > "$RUNNER_TEMP/worker-secrets.json"
           echo "Publishing $(jq -r 'keys | join(", ")' "$RUNNER_TEMP/worker-secrets.json")"
-      - name: Publish Worker secrets
-        if: steps.worker-secrets.outcome == 'success'
-        # The same pinned action that performs the deploy. Running wrangler out
-        # of the consumer's node_modules instead would put a caller-resolved
-        # binary next to the deployment credential, and would also fail outright
-        # for a consumer that lets this action supply wrangler rather than
-        # depending on it directly.
-        uses: cloudflare/wrangler-action@ebbaa1584979971c8614a24965b4405ff95890e0 # v4.0.0
-        with:
-          apiToken: ${{ secrets.cloudflare-api-token || secrets.BURNT_CLOUDFLARE_API_TOKEN }}
-          accountId: ${{ secrets.cloudflare-account-id || secrets.BURNT_CLOUDFLARE_ACCOUNT_ID }}
-          # deployment-policy.workingDirectory, matching the deploy step below.
-          # wrangler resolves its configuration relative to the working
-          # directory, and a monorepo consumer whose quality and deployment
-          # directories differ would otherwise update a different Worker or none.
-          workingDirectory: ${{ fromJSON(inputs.deployment-policy).workingDirectory }}
-          packageManager: ${{ fromJSON(inputs.deployment-policy).packageManager }}
-          command: >-
-            secret bulk ${{ runner.temp }}/worker-secrets.json
-            ${{ fromJSON(inputs.deployment-policy).topology != 'single' && format('--env {0}', fromJSON(inputs.deployment-policy).targets[inputs.target].wranglerEnv) || '' }}
       - name: Upload or deploy Worker version
         id: wrangler
         uses: cloudflare/wrangler-action@ebbaa1584979971c8614a24965b4405ff95890e0 # v4.0.0
@@ -227,11 +211,19 @@ jobs:
           # second form falls through to the right-hand side every time and
           # would always pass --env. Under single topology there is no wrangler
           # environment to name and passing one fails the deploy.
+          #
+          # --secrets-file follows the same shape. The collect step succeeds only
+          # on a deploy with a non-empty workerSecrets, so a preview never gets
+          # the flag. It needs wrangler 4.74.0 or newer.
           command: >-
             ${{ inputs.operation == 'preview' && 'versions upload' || 'deploy' }}
             ${{ fromJSON(inputs.deployment-policy).topology != 'single' && format('--env {0}', fromJSON(inputs.deployment-policy).targets[inputs.target].wranglerEnv) || '' }}
             --message=${{ inputs.version-tag }}
             --tag "${{ inputs.version-tag }}"
+            ${{ steps.worker-secrets.outcome == 'success' && format('--secrets-file {0}/worker-secrets.json', runner.temp) || '' }}
+      - name: Remove Worker secrets file
+        if: always() && steps.worker-secrets.outcome == 'success'
+        run: rm -f "$RUNNER_TEMP/worker-secrets.json"
       - name: Extract Cloudflare metadata
         id: metadata
         env:
diff --git a/AGENTS.md b/AGENTS.md
index 69ee6cb..eb134d8 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -470,8 +470,10 @@ deploy carries the declared ones across:
 ```
 
 Each name must exist as a secret on the target GitHub Environment. Before
-creating the version, `cloudflare-version.yml` collects them and runs
-`wrangler secret bulk`, so the version picks them up.
+creating the version, `cloudflare-version.yml` collects them and passes them to
+the deploy as `--secrets-file`, so the new version is created with them. The
+consumer's wrangler must be 4.74.0 or newer, the first release with
+`--secrets-file`.
 
 **The allowlist is the entire safety property.** `toJSON(secrets)` in that step
 contains every secret the caller inherited, the Cloudflare API token included.
@@ -483,13 +485,15 @@ not skip the secret and carry on — absent configuration that degrades quietly
 how a Worker ends up running without a credential it needs and reporting
 success.
 
-**Secrets are published on deploy, never on preview.** `wrangler secret bulk`
-creates a Worker version and deploys it immediately, so running it on a preview
-would serve an intermediate version — on a `chain` repository that means mainnet
-starts serving from a job whose entire purpose is not to serve. A preview
-therefore runs against whatever secrets are already on the Worker, the same way
-it inherits its bindings. A brand-new secret is live from the first deploy that
-publishes it, not from the preview before it.
+**Secrets are published on deploy, never on preview.** A preview must not
+change what a target's secrets are, and on `chain` the release target's secrets
+are mainnet's. A preview therefore runs against whatever secrets are already on
+the Worker, the same way it inherits its bindings. A brand-new secret is live
+from the first deploy that publishes it, not from the preview before it.
+
+`wrangler secret bulk` is deliberately not used: it edits the _latest_ version
+and fails with Cloudflare error 10215 when that version is an undeployed upload,
+which is the normal state after any preview or `single`-topology candidate.
 
 **Removing a name from `workerSecrets` does not revoke it.** The list is an
 upsert, not a reconciliation: the deploy sets what it names and leaves
diff --git a/tests/workflows.test.mjs b/tests/workflows.test.mjs
index 9b890c7..f1af347 100644
--- a/tests/workflows.test.mjs
+++ b/tests/workflows.test.mjs
@@ -524,9 +524,8 @@ test("Worker secrets are allowlisted, never forwarded wholesale", () => {
 });
 
 test("Worker secrets are published on deploy but never on preview", () => {
-  // `wrangler secret bulk` creates a version and deploys it immediately, so
-  // doing this on a preview would serve an intermediate version — on a chain
-  // repository, straight to mainnet from a job whose purpose is not to serve.
+  // A preview must not change what a target's secrets are, and on a chain
+  // repository the release target's secrets are mainnet's.
   const workflow = parse(
     fs.readFileSync(`${directory}/cloudflare-version.yml`, "utf8"),
   );
@@ -536,21 +535,32 @@ test("Worker secrets are published on deploy but never on preview", () => {
   assert.match(collect.if, /inputs\.operation == 'deploy'/);
 });
 
-test("Worker secrets are published by the pinned action, not consumer wrangler", () => {
-  // Resolving wrangler from the consumer's node_modules would put a
-  // caller-controlled binary in the same step as the deployment credential.
+test("Worker secrets ride on the pinned deploy, not a separate secret edit", () => {
+  // `wrangler secret bulk` edits the latest version and fails with 10215
+  // when that version is an undeployed 0% upload, which every single-topology
+  // flow leaves behind. `deploy --secrets-file` creates the version with the
+  // secrets instead.
   const workflow = parse(
     fs.readFileSync(`${directory}/cloudflare-version.yml`, "utf8"),
   );
-  const publish = workflow.jobs.version.steps.find(
-    (step) => step.name === "Publish Worker secrets",
+  const steps = workflow.jobs.version.steps;
+  assert.equal(
+    steps.find((step) => step.name === "Publish Worker secrets"),
+    undefined,
   );
-  assert.match(publish.uses, /^cloudflare\/wrangler-action@[0-9a-f]{40}$/);
-  assert.match(publish.command ?? publish.with.command, /secret bulk/);
+  const deploy = steps.find((step) => step.id === "wrangler");
+  assert.match(deploy.uses, /^cloudflare\/wrangler-action@[0-9a-f]{40}$/);
   assert.match(
-    publish.with.workingDirectory,
+    deploy.with.workingDirectory,
     /deployment-policy\)\.workingDirectory/,
   );
+  assert.match(
+    deploy.with.command,
+    /steps\.worker-secrets\.outcome == 'success' && format\('--secrets-file /,
+  );
+  assert.doesNotMatch(deploy.with.command, /&& ''/);
+  const source = fs.readFileSync(`${directory}/cloudflare-version.yml`, "utf8");
+  assert.doesNotMatch(source, /secret bulk/);
 });
 
 test("a missing declared Worker secret fails the deploy", () => {