diff --git a/.github/workflows/cs.yml b/.github/workflows/cs.yml
index 9b88a057..fd6b61be 100644
--- a/.github/workflows/cs.yml
+++ b/.github/workflows/cs.yml
@@ -26,15 +26,6 @@ jobs:
           tools: cs2pr
           coverage: none
 
-      # PHPCS does not need PHPUnit, and the PHPUnit versions pinned in composer.json
-      # are all blocked by a security advisory, which fails the install. Removing the
-      # requirement lets the Polyfills pull a PHPUnit version which is not blocked.
-      # The Composer command will exit with error code 2 as the package is not removed,
-      # so ignore "failure" of this step.
-      - name: Remove the PHPUnit requirement
-        continue-on-error: true
-        run: composer remove --dev phpunit/phpunit --no-update --no-interaction || true
-
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3fe093ea..af09d59f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -145,15 +145,6 @@ jobs:
         continue-on-error: true
         run: composer remove --dev phpunit/phpunit --no-update --no-interaction || true
 
-      # WP < 5.9 predates the Polyfills bootstrap in Core, so those builds need PHPUnit 5 - 7.
-      # Those lines are end of life and have no release outside CVE-2026-24765, which Composer
-      # blocks by default, so the install fails before the tests can run. Allow that one
-      # advisory for these builds only. WP 5.9 and up drop the requirement above and resolve
-      # a PHPUnit release the advisory does not cover.
-      - name: Allow the end of life PHPUnit which older WP needs
-        if: ${{ steps.composer_toggle.outputs.TYPE == '2' || steps.composer_toggle.outputs.TYPE == '3' }}
-        run: composer config --json policy.advisories.ignore-id '["PKSA-z3gr-8qht-p93v"]'
-
       # Install dependencies and handle caching in one go.
       # @link https://github.com/marketplace/actions/install-php-dependencies-with-composer
       - name: Install Composer dependencies - normal
diff --git a/composer.json b/composer.json
index 7b4f5fc7..ea73f782 100644
--- a/composer.json
+++ b/composer.json
@@ -28,6 +28,13 @@
             "dealerdirect/phpcodesniffer-composer-installer": true
         },
         "process-timeout": 900,
-        "lock": false
+        "lock": false,
+        "policy": {
+            "advisories": {
+                "ignore-id": {
+                    "PKSA-z3gr-8qht-p93v": "Concerns .phpt test files, which this plugin does not use. WordPress below 5.9 needs PHPUnit 5 to 7, and every release in that range carries it."
+                }
+            }
+        }
     }
 }