diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 68ea79e9..429983c1 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -58,7 +58,7 @@ jobs:
 
       - name: php-cs-fixer
         run: |
-          vendor/bin/php-cs-fixer fix --dry-run --diff
+          vendor/bin/php-cs-fixer fix --dry-run --diff --allow-risky=yes
 
   static-analysis:
     runs-on: ubuntu-24.04
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index a2f9d0c6..6000a764 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -8,6 +8,7 @@
 return (new PhpCsFixer\Config())
     ->setRules([
         '@Symfony' => true,
+        'declare_strict_types' => true,
         'phpdoc_annotation_without_dot' => false,
         'nullable_type_declaration_for_default_null_value' => [
             'use_nullable_type_declaration' => true,
diff --git a/src/Api/Api.php b/src/Api/Api.php
index 8c0f6624..d66a42ee 100644
--- a/src/Api/Api.php
+++ b/src/Api/Api.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Api;
 
 use Intervention\Image\Decoders\BinaryImageDecoder;
diff --git a/src/Api/ApiInterface.php b/src/Api/ApiInterface.php
index 7956457d..72b5fbc2 100644
--- a/src/Api/ApiInterface.php
+++ b/src/Api/ApiInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Api;
 
 interface ApiInterface
diff --git a/src/Api/Encoder.php b/src/Api/Encoder.php
index 5422d859..80aad014 100644
--- a/src/Api/Encoder.php
+++ b/src/Api/Encoder.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Api;
 
 use Intervention\Image\Interfaces\EncodedImageInterface;
diff --git a/src/Filesystem/FileNotFoundException.php b/src/Filesystem/FileNotFoundException.php
index cc0a3598..2a03d3ce 100644
--- a/src/Filesystem/FileNotFoundException.php
+++ b/src/Filesystem/FileNotFoundException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Filesystem;
 
 class FileNotFoundException extends \Exception
diff --git a/src/Filesystem/FilesystemException.php b/src/Filesystem/FilesystemException.php
index 6826f82a..6949bb9c 100644
--- a/src/Filesystem/FilesystemException.php
+++ b/src/Filesystem/FilesystemException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Filesystem;
 
 class FilesystemException extends \Exception
diff --git a/src/Manipulators/Background.php b/src/Manipulators/Background.php
index 75ad6d8c..95571616 100644
--- a/src/Manipulators/Background.php
+++ b/src/Manipulators/Background.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/BaseManipulator.php b/src/Manipulators/BaseManipulator.php
index 61df0e15..b2f89dc9 100644
--- a/src/Manipulators/BaseManipulator.php
+++ b/src/Manipulators/BaseManipulator.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Blur.php b/src/Manipulators/Blur.php
index 236e4f5d..5f6ac58d 100644
--- a/src/Manipulators/Blur.php
+++ b/src/Manipulators/Blur.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Border.php b/src/Manipulators/Border.php
index 7e911e31..ce5befd5 100644
--- a/src/Manipulators/Border.php
+++ b/src/Manipulators/Border.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Geometry\Factories\RectangleFactory;
diff --git a/src/Manipulators/Brightness.php b/src/Manipulators/Brightness.php
index 27a3fd64..318f767d 100644
--- a/src/Manipulators/Brightness.php
+++ b/src/Manipulators/Brightness.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Contrast.php b/src/Manipulators/Contrast.php
index 176cd0a7..c005394e 100644
--- a/src/Manipulators/Contrast.php
+++ b/src/Manipulators/Contrast.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Crop.php b/src/Manipulators/Crop.php
index 54546482..7a1170b2 100644
--- a/src/Manipulators/Crop.php
+++ b/src/Manipulators/Crop.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Filter.php b/src/Manipulators/Filter.php
index 775e590b..716f8501 100644
--- a/src/Manipulators/Filter.php
+++ b/src/Manipulators/Filter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Flip.php b/src/Manipulators/Flip.php
index 9e5e6b3e..5c34cec1 100644
--- a/src/Manipulators/Flip.php
+++ b/src/Manipulators/Flip.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Gamma.php b/src/Manipulators/Gamma.php
index b0fe3ab3..d967e494 100644
--- a/src/Manipulators/Gamma.php
+++ b/src/Manipulators/Gamma.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Helpers/Color.php b/src/Manipulators/Helpers/Color.php
index 5ade9043..fe88f446 100644
--- a/src/Manipulators/Helpers/Color.php
+++ b/src/Manipulators/Helpers/Color.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators\Helpers;
 
 class Color
diff --git a/src/Manipulators/Helpers/Dimension.php b/src/Manipulators/Helpers/Dimension.php
index b6567e47..2e5b5798 100644
--- a/src/Manipulators/Helpers/Dimension.php
+++ b/src/Manipulators/Helpers/Dimension.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators\Helpers;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/ManipulatorInterface.php b/src/Manipulators/ManipulatorInterface.php
index d04c266d..93a4153d 100644
--- a/src/Manipulators/ManipulatorInterface.php
+++ b/src/Manipulators/ManipulatorInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Orientation.php b/src/Manipulators/Orientation.php
index d48ef0d4..24ad728d 100644
--- a/src/Manipulators/Orientation.php
+++ b/src/Manipulators/Orientation.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Pixelate.php b/src/Manipulators/Pixelate.php
index 2fc3cf5e..02643e28 100644
--- a/src/Manipulators/Pixelate.php
+++ b/src/Manipulators/Pixelate.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Sharpen.php b/src/Manipulators/Sharpen.php
index 6d8e89b9..7a50903e 100644
--- a/src/Manipulators/Sharpen.php
+++ b/src/Manipulators/Sharpen.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Manipulators/Size.php b/src/Manipulators/Size.php
index e9404fb7..9ab127ba 100644
--- a/src/Manipulators/Size.php
+++ b/src/Manipulators/Size.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Geometry\Rectangle;
diff --git a/src/Manipulators/Watermark.php b/src/Manipulators/Watermark.php
index 2abd276d..fb59bf76 100644
--- a/src/Manipulators/Watermark.php
+++ b/src/Manipulators/Watermark.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/src/Responses/PsrResponseFactory.php b/src/Responses/PsrResponseFactory.php
index 41a658ff..0c725a96 100644
--- a/src/Responses/PsrResponseFactory.php
+++ b/src/Responses/PsrResponseFactory.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Responses;
 
 use League\Flysystem\FilesystemOperator;
diff --git a/src/Responses/ResponseFactoryInterface.php b/src/Responses/ResponseFactoryInterface.php
index 330d455d..48dc6503 100644
--- a/src/Responses/ResponseFactoryInterface.php
+++ b/src/Responses/ResponseFactoryInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Responses;
 
 use League\Flysystem\FilesystemOperator;
diff --git a/src/Server.php b/src/Server.php
index 8f73b90f..643b5144 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide;
 
 use League\Flysystem\FilesystemException as FilesystemV2Exception;
diff --git a/src/ServerFactory.php b/src/ServerFactory.php
index d2e9acc5..abb42be9 100644
--- a/src/ServerFactory.php
+++ b/src/ServerFactory.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide;
 
 use Intervention\Image\ImageManager;
diff --git a/src/Signatures/Signature.php b/src/Signatures/Signature.php
index 7562996c..5c366c96 100644
--- a/src/Signatures/Signature.php
+++ b/src/Signatures/Signature.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Signatures;
 
 class Signature implements SignatureInterface
diff --git a/src/Signatures/SignatureException.php b/src/Signatures/SignatureException.php
index 76722e0f..f4fecb10 100644
--- a/src/Signatures/SignatureException.php
+++ b/src/Signatures/SignatureException.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Signatures;
 
 class SignatureException extends \Exception
diff --git a/src/Signatures/SignatureFactory.php b/src/Signatures/SignatureFactory.php
index 17a1d3e4..4170ca9a 100644
--- a/src/Signatures/SignatureFactory.php
+++ b/src/Signatures/SignatureFactory.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Signatures;
 
 class SignatureFactory
diff --git a/src/Signatures/SignatureInterface.php b/src/Signatures/SignatureInterface.php
index 7d9ae44d..12f57b97 100644
--- a/src/Signatures/SignatureInterface.php
+++ b/src/Signatures/SignatureInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Signatures;
 
 interface SignatureInterface
diff --git a/src/Urls/UrlBuilder.php b/src/Urls/UrlBuilder.php
index 8ff2f7f8..2fb6123c 100644
--- a/src/Urls/UrlBuilder.php
+++ b/src/Urls/UrlBuilder.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Urls;
 
 use League\Glide\Signatures\SignatureInterface;
diff --git a/src/Urls/UrlBuilderFactory.php b/src/Urls/UrlBuilderFactory.php
index a5c6ae6f..9ddea6cf 100644
--- a/src/Urls/UrlBuilderFactory.php
+++ b/src/Urls/UrlBuilderFactory.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Urls;
 
 use League\Glide\Signatures\SignatureFactory;
diff --git a/tests/Api/ApiTest.php b/tests/Api/ApiTest.php
index 9b366703..b102b6cc 100644
--- a/tests/Api/ApiTest.php
+++ b/tests/Api/ApiTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Api;
 
 use Intervention\Image\ImageManager;
diff --git a/tests/Api/EncoderTest.php b/tests/Api/EncoderTest.php
index 3def110b..6a4723a9 100644
--- a/tests/Api/EncoderTest.php
+++ b/tests/Api/EncoderTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Api;
 
 use Intervention\Image\Encoders\MediaTypeEncoder;
diff --git a/tests/Manipulators/BackgroundTest.php b/tests/Manipulators/BackgroundTest.php
index 6276434a..34f42cfb 100644
--- a/tests/Manipulators/BackgroundTest.php
+++ b/tests/Manipulators/BackgroundTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\DriverInterface;
diff --git a/tests/Manipulators/BlurTest.php b/tests/Manipulators/BlurTest.php
index f41543e3..0da1414b 100644
--- a/tests/Manipulators/BlurTest.php
+++ b/tests/Manipulators/BlurTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/BorderTest.php b/tests/Manipulators/BorderTest.php
index 15deff9b..c8271ad6 100644
--- a/tests/Manipulators/BorderTest.php
+++ b/tests/Manipulators/BorderTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Geometry\Factories\RectangleFactory;
diff --git a/tests/Manipulators/BrightnessTest.php b/tests/Manipulators/BrightnessTest.php
index 5f0a657f..bcbfb3b5 100644
--- a/tests/Manipulators/BrightnessTest.php
+++ b/tests/Manipulators/BrightnessTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/ContrastTest.php b/tests/Manipulators/ContrastTest.php
index a814bd07..354deab1 100644
--- a/tests/Manipulators/ContrastTest.php
+++ b/tests/Manipulators/ContrastTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/CropTest.php b/tests/Manipulators/CropTest.php
index 627ad007..aced48dd 100644
--- a/tests/Manipulators/CropTest.php
+++ b/tests/Manipulators/CropTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/FilterTest.php b/tests/Manipulators/FilterTest.php
index a49833e8..5d997fec 100644
--- a/tests/Manipulators/FilterTest.php
+++ b/tests/Manipulators/FilterTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/FlipTest.php b/tests/Manipulators/FlipTest.php
index aa7fec15..bbae4434 100644
--- a/tests/Manipulators/FlipTest.php
+++ b/tests/Manipulators/FlipTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/GammaTest.php b/tests/Manipulators/GammaTest.php
index a1907ccd..bc4236cb 100644
--- a/tests/Manipulators/GammaTest.php
+++ b/tests/Manipulators/GammaTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/Helpers/ColorTest.php b/tests/Manipulators/Helpers/ColorTest.php
index 6e688a60..7ce4f651 100644
--- a/tests/Manipulators/Helpers/ColorTest.php
+++ b/tests/Manipulators/Helpers/ColorTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators\Helpers;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/Manipulators/Helpers/DimensionTest.php b/tests/Manipulators/Helpers/DimensionTest.php
index 021fca68..da06b99f 100644
--- a/tests/Manipulators/Helpers/DimensionTest.php
+++ b/tests/Manipulators/Helpers/DimensionTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators\Helpers;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/OrientationTest.php b/tests/Manipulators/OrientationTest.php
index 25ec2504..1a4932bb 100644
--- a/tests/Manipulators/OrientationTest.php
+++ b/tests/Manipulators/OrientationTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/PixelateTest.php b/tests/Manipulators/PixelateTest.php
index 04abd105..1e33b993 100644
--- a/tests/Manipulators/PixelateTest.php
+++ b/tests/Manipulators/PixelateTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/SharpenTest.php b/tests/Manipulators/SharpenTest.php
index b6795120..c33a2e12 100644
--- a/tests/Manipulators/SharpenTest.php
+++ b/tests/Manipulators/SharpenTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/SizeTest.php b/tests/Manipulators/SizeTest.php
index f8fbdeeb..1153f9b1 100644
--- a/tests/Manipulators/SizeTest.php
+++ b/tests/Manipulators/SizeTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\ImageInterface;
diff --git a/tests/Manipulators/WatermarkTest.php b/tests/Manipulators/WatermarkTest.php
index fdef23f6..e2f5bdf2 100644
--- a/tests/Manipulators/WatermarkTest.php
+++ b/tests/Manipulators/WatermarkTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Manipulators;
 
 use Intervention\Image\Interfaces\DriverInterface;
diff --git a/tests/Responses/PsrResponseFactoryTest.php b/tests/Responses/PsrResponseFactoryTest.php
index 68b3fedb..bbd745ae 100644
--- a/tests/Responses/PsrResponseFactoryTest.php
+++ b/tests/Responses/PsrResponseFactoryTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Responses;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/ServerFactoryTest.php b/tests/ServerFactoryTest.php
index 74350c1d..97d2639a 100644
--- a/tests/ServerFactoryTest.php
+++ b/tests/ServerFactoryTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/ServerTest.php b/tests/ServerTest.php
index af7a7544..ad1d2f31 100644
--- a/tests/ServerTest.php
+++ b/tests/ServerTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide;
 
 use League\Glide\Filesystem\FileNotFoundException;
diff --git a/tests/Signatures/SignatureFactoryTest.php b/tests/Signatures/SignatureFactoryTest.php
index 7b36d68a..3c9ee8c8 100644
--- a/tests/Signatures/SignatureFactoryTest.php
+++ b/tests/Signatures/SignatureFactoryTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Signatures;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/Signatures/SignatureTest.php b/tests/Signatures/SignatureTest.php
index c3cce184..7a82207c 100644
--- a/tests/Signatures/SignatureTest.php
+++ b/tests/Signatures/SignatureTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Signatures;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/Urls/UrlBuilderFactoryTest.php b/tests/Urls/UrlBuilderFactoryTest.php
index 254095f6..a37350cc 100644
--- a/tests/Urls/UrlBuilderFactoryTest.php
+++ b/tests/Urls/UrlBuilderFactoryTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Urls;
 
 use PHPUnit\Framework\TestCase;
diff --git a/tests/Urls/UrlBuilderTest.php b/tests/Urls/UrlBuilderTest.php
index 7656539f..e4e0295c 100644
--- a/tests/Urls/UrlBuilderTest.php
+++ b/tests/Urls/UrlBuilderTest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace League\Glide\Urls;
 
 use League\Glide\Signatures\Signature;