diff --git a/src/Task/ESLint.php b/src/Task/ESLint.php
index df136178..0a37c12c 100644
--- a/src/Task/ESLint.php
+++ b/src/Task/ESLint.php
@@ -11,6 +11,7 @@
 use GrumPHP\Task\Context\ContextInterface;
 use GrumPHP\Task\Context\GitPreCommitContext;
 use GrumPHP\Task\Context\RunContext;
+use Symfony\Component\OptionsResolver\Options;
 use Symfony\Component\OptionsResolver\OptionsResolver;
 use Symfony\Component\Process\Process;
 
@@ -23,8 +24,8 @@ public static function getConfigurableOptions(): OptionsResolver
             // Task config options
             'bin' => null,
             'triggered_by' => ['js', 'jsx', 'ts', 'tsx', 'vue'],
-            'whitelist_patterns' => null,
-            
+            'whitelist_patterns' => [],
+
             // ESLint native config options
             'config' => null,
             'ignore_path' => null,
@@ -39,7 +40,7 @@ public static function getConfigurableOptions(): OptionsResolver
         $resolver->addAllowedTypes('bin', ['null', 'string']);
         $resolver->addAllowedTypes('whitelist_patterns', ['null', 'array']);
         $resolver->addAllowedTypes('triggered_by', ['array']);
-        
+
         // ESLint native config options
         $resolver->addAllowedTypes('config', ['null', 'string']);
         $resolver->addAllowedTypes('ignore_path', ['null', 'string']);
@@ -49,6 +50,19 @@ public static function getConfigurableOptions(): OptionsResolver
         $resolver->addAllowedTypes('no_eslintrc', ['bool']);
         $resolver->addAllowedTypes('quiet', ['bool']);
 
+        $resolver->setDeprecated(
+            'whitelist_patterns',
+            'phpro/grumphp',
+            '1.14',
+            function (Options $options, $value): string {
+                if (null === $value) {
+                    return 'Parsing "null" to option "whitelist_patterns" is deprecated, pass an array instead.';
+                }
+
+                return '';
+            }
+        );
+
         return $resolver;
     }
 
diff --git a/test/Unit/Task/ESLintTest.php b/test/Unit/Task/ESLintTest.php
index 43531ed8..d2dc775d 100644
--- a/test/Unit/Task/ESLintTest.php
+++ b/test/Unit/Task/ESLintTest.php
@@ -29,7 +29,7 @@ public function provideConfigurableOptions(): iterable
                 // Task config options
                 'bin' => null,
                 'triggered_by' => ['js', 'jsx', 'ts', 'tsx', 'vue'],
-                'whitelist_patterns' => null,
+                'whitelist_patterns' => [],
 
                 // ESLint native config options
                 'config' => null,
@@ -207,4 +207,11 @@ public function provideExternalTaskRuns(): iterable
             ]
         ];
     }
+
+    /**
+     * @test
+     */
+    public function it_triggers_deprecation_on_null() {
+        self::assertTrue(ESLint::getConfigurableOptions()->isDeprecated('whitelist_patterns'));
+    }
 }