diff --git a/src/Faker/Container/Container.php b/src/Faker/Container/Container.php
index 2dd2d974d7..409a7406a0 100644
--- a/src/Faker/Container/Container.php
+++ b/src/Faker/Container/Container.php
@@ -16,9 +16,9 @@ final class Container implements ContainerInterface
     /**
      * @var array<string, callable|object|string>
      */
-    private $definitions;
+    private array $definitions;
 
-    private $services = [];
+    private array $services = [];
 
     /**
      * Create a container object with a set of definitions. The array value MUST
diff --git a/src/Faker/Container/ContainerBuilder.php b/src/Faker/Container/ContainerBuilder.php
index 3fb335fff5..e5105c9d5c 100644
--- a/src/Faker/Container/ContainerBuilder.php
+++ b/src/Faker/Container/ContainerBuilder.php
@@ -22,7 +22,7 @@ final class ContainerBuilder
     /**
      * @var array<string, callable|object|string>
      */
-    private $definitions = [];
+    private array $definitions = [];
 
     /**
      * @param callable|object|string $value