diff --git a/.github/workflows/harness.yml b/.github/workflows/harness.yml
index 178965d..623ab53 100644
--- a/.github/workflows/harness.yml
+++ b/.github/workflows/harness.yml
@@ -14,6 +14,6 @@ permissions: {}
 
 jobs:
   harness:
-    uses: Pollora/harness/.github/workflows/php-package.yml@v0.1.4
+    uses: Pollora/harness/.github/workflows/php-package.yml@v0.1.6
     permissions:
       contents: read
diff --git a/.harness.json b/.harness.json
index 1df732b..1e2f1a1 100644
--- a/.harness.json
+++ b/.harness.json
@@ -9,7 +9,6 @@
         "phpstan_baseline": 0
     },
     "observed": [
-        "Rector",
-        "Dependency analysis"
+        "Rector"
     ]
 }
diff --git a/composer-dependency-analyser.php b/composer-dependency-analyser.php
new file mode 100644
index 0000000..d075f48
--- /dev/null
+++ b/composer-dependency-analyser.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+use ShipMonk\ComposerDependencyAnalyser\Config\ErrorType;
+
+/*
+ * ARCH-07: the harness preset (WordPress classes and functions, the tests), plus what is specific to this package.
+ */
+$configuration = require __DIR__.'/vendor/pollora/harness/presets/composer-dependency-analyser.php';
+
+return $configuration
+    // Action Scheduler is a plugin and Cron_Event_Command belongs to WP-CLI: neither is a Composer dependency.
+    ->ignoreUnknownClassesRegex('~^(ActionScheduler|Cron_Event_Command$)~')
+    // illuminate/collections and the discovery package's spatie/php-structure-discoverer come with pollora/discovery and the framework.
+    ->ignoreErrorsOnPackages(['illuminate/collections', 'spatie/php-structure-discoverer'], [ErrorType::SHADOW_DEPENDENCY])
+    // ScheduleFake is a testing helper: it asserts with PHPUnit, which every project that tests has.
+    ->ignoreErrorsOnPackage('phpunit/phpunit', [ErrorType::SHADOW_DEPENDENCY]);
diff --git a/composer.json b/composer.json
index 01c5d53..6b25311 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
         "mockery/mockery": "^1.6.12",
         "pestphp/pest": "^3.8.2",
         "phpstan/phpstan": "^2.1.16",
-        "pollora/harness": "^0.1.4",
+        "pollora/harness": "^0.1.6",
         "szepeviktor/phpstan-wordpress": "^2.0"
     },
     "autoload": {