diff --git a/pint.json b/pint.json
index eef5a35..c7c9e41 100644
--- a/pint.json
+++ b/pint.json
@@ -4,6 +4,7 @@
     "Laravel/laravel_phpdoc_separation": false,
     "concat_space": {
       "spacing": "one"
-    }
+    },
+    "declare_strict_types": true
   }
 }
diff --git a/src/Events/PipePassed.php b/src/Events/PipePassed.php
index f4a9df1..62ec7d8 100644
--- a/src/Events/PipePassed.php
+++ b/src/Events/PipePassed.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Events;
 
 class PipePassed
diff --git a/src/Events/PipeStarted.php b/src/Events/PipeStarted.php
index 10a4641..7f0b5fa 100644
--- a/src/Events/PipeStarted.php
+++ b/src/Events/PipeStarted.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Events;
 
 class PipeStarted
diff --git a/src/Pipeline.php b/src/Pipeline.php
index bfa896f..f3eaa00 100644
--- a/src/Pipeline.php
+++ b/src/Pipeline.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline;
 
 use Closure;
diff --git a/tests/OriginalPipelineTest.php b/tests/OriginalPipelineTest.php
index 4daddf4..9789c1c 100644
--- a/tests/OriginalPipelineTest.php
+++ b/tests/OriginalPipelineTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Tests;
 
 use Illuminate\Container\Container;
diff --git a/tests/PipelineEventsTest.php b/tests/PipelineEventsTest.php
index 8c16114..2ab3537 100644
--- a/tests/PipelineEventsTest.php
+++ b/tests/PipelineEventsTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Tests;
 
 use Illuminate\Support\Facades\Event;
diff --git a/tests/PipelineRunHelperTest.php b/tests/PipelineRunHelperTest.php
index 7d965e8..5387370 100644
--- a/tests/PipelineRunHelperTest.php
+++ b/tests/PipelineRunHelperTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Tests;
 
 use MichaelRubel\EnhancedPipeline\Pipeline;
diff --git a/tests/PipelineTest.php b/tests/PipelineTest.php
index 3803e72..80e3c66 100644
--- a/tests/PipelineTest.php
+++ b/tests/PipelineTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Tests;
 
 use Illuminate\Contracts\Container\BindingResolutionException;
diff --git a/tests/TestCase.php b/tests/TestCase.php
index cdd4003..3a09b35 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace MichaelRubel\EnhancedPipeline\Tests;
 
 use MichaelRubel\EnhancedPipeline\EnhancedPipelineServiceProvider;