diff --git a/public/index.php b/public/index.php
index da59132..4e2e452 100644
--- a/public/index.php
+++ b/public/index.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 require_once __DIR__ . '/../vendor/autoload.php';
 
 use Dotenv\Dotenv;
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index d21c14d..06fdcb4 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -1,3 +1,5 @@
 <?php
 
+declare(strict_types=1);
+
 require __DIR__ . '/../vendor/autoload.php';