diff --git a/tests/Unit/CollectionTest.php b/tests/Unit/CollectionTest.php
index 0b36e430..0637cc3b 100644
--- a/tests/Unit/CollectionTest.php
+++ b/tests/Unit/CollectionTest.php
@@ -51,7 +51,7 @@ final class CollectionTest extends BaseTestCase
     {
         $collection = new Collection(['foo', 'bar', 'baz']);
         $this->assertEquals(3, $collection->count());
-        $collection = $collection->filter(function ($text) {
+        $collection = $collection->filter(function ($text): bool {
             return substr($text, 0, 1) == 'b';
         });
         $this->assertEquals(2, $collection->count());
diff --git a/tests/Unit/Modifiers/TextModifierTest.php b/tests/Unit/Modifiers/TextModifierTest.php
index 50b3d9ba..a8d98916 100644
--- a/tests/Unit/Modifiers/TextModifierTest.php
+++ b/tests/Unit/Modifiers/TextModifierTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace Intervention\Image\Tests\Unit\Modifiers;
 
 use Intervention\Image\Geometry\Point;
+use Intervention\Image\Interfaces\FontInterface;
 use Intervention\Image\Modifiers\TextModifier;
 use Intervention\Image\Tests\BaseTestCase;
 use Intervention\Image\Typography\Font;
@@ -17,7 +18,7 @@ final class TextModifierTest extends BaseTestCase
     {
         $modifier = new class ('test', new Point(), new Font()) extends TextModifier
         {
-            public function testStrokeOffsets($font)
+            public function testStrokeOffsets(FontInterface $font)
             {
                 return $this->strokeOffsets($font);
             }