diff --git a/tests/Controller/GraphiQLControllerTest.php b/tests/Controller/GraphiQLControllerTest.php
index c51d656..3d2c2d4 100644
--- a/tests/Controller/GraphiQLControllerTest.php
+++ b/tests/Controller/GraphiQLControllerTest.php
@@ -29,7 +29,7 @@ public function testDefaultSchema(): void
 
         $this->assertInstanceOf(Response::class, $response);
         $this->assertSame(200, $response->getStatusCode(), $response->getContent());
-        $this->stringContains('Loading...', $response->getContent());
+        $this->assertStringContainsString('Loading...', $response->getContent());
     }
 
     public function testDefaultSchemaViaMultipleRoute(): void
@@ -41,6 +41,6 @@ public function testDefaultSchemaViaMultipleRoute(): void
 
         $this->assertInstanceOf(Response::class, $response);
         $this->assertSame(200, $response->getStatusCode());
-        $this->stringContains('Loading...', $response->getContent());
+        $this->assertStringContainsString('Loading...', $response->getContent());
     }
 }
diff --git a/tests/Integration/OverblogGraphQLBundle/Controller/GraphiQLControllerTest.php b/tests/Integration/OverblogGraphQLBundle/Controller/GraphiQLControllerTest.php
index a7ff443..f59f810 100644
--- a/tests/Integration/OverblogGraphQLBundle/Controller/GraphiQLControllerTest.php
+++ b/tests/Integration/OverblogGraphQLBundle/Controller/GraphiQLControllerTest.php
@@ -18,7 +18,7 @@ public function testDefaultSchema(): void
 
         $this->assertInstanceOf(Response::class, $response);
         $this->assertSame(200, $response->getStatusCode());
-        $this->stringContains('Loading...', $response->getContent());
-        $this->stringContains('var endpoint = "\/"', $response->getContent());
+        $this->assertStringContainsString('Loading...', $response->getContent());
+        $this->assertStringContainsString('var endpoint = "\/"', $response->getContent());
     }
 }