diff --git a/.github/workflows/pr-review-mention.yml b/.github/workflows/pr-review-mention.yml
index d0df00a..ce69a49 100644
--- a/.github/workflows/pr-review-mention.yml
+++ b/.github/workflows/pr-review-mention.yml
@@ -47,7 +47,7 @@ jobs:
   pr-review-mention:
     permissions:
       pull-requests: write
-    uses: petry-projects/.github/.github/workflows/pr-review-mention-reusable.yml@pr-review-mention/stable  # NOSONAR(githubactions:S7637) first-party channel ref
+    uses: petry-projects/.github/.github/workflows/pr-review-mention-reusable.yml@pr-review-mention/v2-stable  # NOSONAR(githubactions:S7637) first-party channel ref
     secrets:
       GH_PAT_WORKFLOWS: ${{ secrets.GH_PAT_DON_PETRY || secrets.GH_PAT_WORKFLOWS }}
       DON_PETRY_BOT_GH_PAT: ${{ secrets.DON_PETRY_BOT_GH_PAT }}
diff --git a/scripts/tests/pr-review-mention-workflow.bats b/scripts/tests/pr-review-mention-workflow.bats
index 7f5fc16..7b8aa2b 100644
--- a/scripts/tests/pr-review-mention-workflow.bats
+++ b/scripts/tests/pr-review-mention-workflow.bats
@@ -94,15 +94,19 @@ print('ok')
   [[ "$output" == "ok" ]]
 }
 
-@test "pr-review-mention still delegates to the org reusable at the stable channel" {
+@test "pr-review-mention still delegates to the org reusable at the v2-stable channel" {
+  # Must pin the major-scoped channel @pr-review-mention/v2-stable, not the bare
+  # tier @pr-review-mention/stable. The org standard (ci-standards.md →
+  # centralization tiers) treats a bare tier pin as drift; the canonical stub
+  # delegates to ...@pr-review-mention/v<M>-stable (#401).
   run python3 -c "
 import sys, yaml
 wf = yaml.safe_load(open(sys.argv[1])) or {}
 jobs = wf.get('jobs') or {}
 job = jobs.get('pr-review-mention') or {}
 uses = job.get('uses', '')
-expected = 'petry-projects/.github/.github/workflows/pr-review-mention-reusable.yml@pr-review-mention/stable'
-assert uses == expected, f'job must call the org reusable at the stable channel, got: {uses!r}'
+expected = 'petry-projects/.github/.github/workflows/pr-review-mention-reusable.yml@pr-review-mention/v2-stable'
+assert uses == expected, f'job must call the org reusable at the v2-stable channel, got: {uses!r}'
 print('ok')
 " "$WORKFLOW"
   [ "$status" -eq 0 ]