diff --git a/src/DataFixtures/HistoryFixtures.php b/src/DataFixtures/HistoryFixtures.php
index a6068ad..e0111e7 100644
--- a/src/DataFixtures/HistoryFixtures.php
+++ b/src/DataFixtures/HistoryFixtures.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\DataFixtures;
 
 use App\Entity\History;
diff --git a/src/Entity/History.php b/src/Entity/History.php
index ecda7f8..a53340e 100644
--- a/src/Entity/History.php
+++ b/src/Entity/History.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Entity;
 
 use App\Repository\HistoryRepository;
diff --git a/src/Repository/HistoryRepository.php b/src/Repository/HistoryRepository.php
index 94808b4..02d50d8 100644
--- a/src/Repository/HistoryRepository.php
+++ b/src/Repository/HistoryRepository.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Repository;
 
 use App\Entity\History;