diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 6f049a0..80d9ad4 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 $finder = Symfony\Component\Finder\Finder::create()
     ->in([
         __DIR__ . '/src'
diff --git a/src/CardServiceProvider.php b/src/CardServiceProvider.php
index 1b0bc10..fa862e4 100644
--- a/src/CardServiceProvider.php
+++ b/src/CardServiceProvider.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Abordage\TableCard;
 
 use Abordage\TableCard\Console\CardCommand;
diff --git a/src/TableCard.php b/src/TableCard.php
index 9a6827f..4ffa64c 100644
--- a/src/TableCard.php
+++ b/src/TableCard.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Abordage\TableCard;
 
 use Illuminate\Database\Eloquent\Model;