diff --git a/app/composer.lock b/app/composer.lock
index 71bc412..c9249a7 100644
--- a/app/composer.lock
+++ b/app/composer.lock
@@ -6242,12 +6242,12 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
         "ext-pdo": "*"
     },
-    "platform-dev": [],
+    "platform-dev": {},
     "plugin-api-version": "2.6.0"
 }
diff --git a/app/src/Controller/User/RegisterUserAction.php b/app/src/Controller/User/RegisterUserAction.php
index 5434669..b408c38 100644
--- a/app/src/Controller/User/RegisterUserAction.php
+++ b/app/src/Controller/User/RegisterUserAction.php
@@ -24,7 +24,7 @@ class RegisterUserAction extends Controller
             'password' => $requestData['password'],
         ]);
 
-        $success = $this->userRepository->save($user);
+        $success = $this->userRepository->create($user);
 
         if ($success) {
             return $this->render('user/success.twig');
diff --git a/app/tests/Controller/User/RegisterUserActionTest.php b/app/tests/Controller/User/RegisterUserActionTest.php
index aacada1..e011d6b 100644
--- a/app/tests/Controller/User/RegisterUserActionTest.php
+++ b/app/tests/Controller/User/RegisterUserActionTest.php
@@ -60,7 +60,7 @@ class RegisterUserActionTest extends TestCase
         /** @var \DI\Container */
         $container = $app->getContainer();
         $userRepository = $this->prophesize(UserRepositoryInterface::class);
-        $userRepository->save($user)->willReturn(true);
+        $userRepository->create($user)->willReturn(true);
         $container->set(
             UserRepositoryInterface::class,
             $userRepository->reveal()
@@ -81,7 +81,7 @@ class RegisterUserActionTest extends TestCase
         $container = $app->getContainer();
 
         $userRepository = $this->prophesize(UserRepositoryInterface::class);
-        $userRepository->save($user)->willReturn(false);
+        $userRepository->create($user)->willReturn(false);
         $container->set(
             UserRepositoryInterface::class, 
             $userRepository->reveal()
@@ -118,7 +118,7 @@ class RegisterUserActionTest extends TestCase
         $container = $app->getContainer();
 
         $userRepository = $this->prophesize(UserRepositoryInterface::class);
-        $userRepository->save($user)->willReturn(true);
+        $userRepository->create($user)->willReturn(true);
 
         $container->set(
             UserRepositoryInterface::class,