diff --git a/composer.json b/composer.json
index 35f8b47..911c55c 100644
--- a/composer.json
+++ b/composer.json
@@ -15,17 +15,17 @@
   "require": {
     "php": ">=7.1",
     "doctrine/orm": "^2.6.3",
-    "symfony/property-access": "^4.4 || ^5.4 || ^6.0",
-    "symfony/property-info": "^4.4 || ^5.4 || ^6.0",
-    "symfony/serializer": "^4.4 || ^5.4 || ^6.0"
+    "symfony/property-access": "^4.4 || ^5.4 || ^6.0 || ^7.0",
+    "symfony/property-info": "^4.4 || ^5.4 || ^6.0 || ^7.0",
+    "symfony/serializer": "^4.4 || ^5.4 || ^6.0 || ^7.0"
   },
   "require-dev": {
     "doctrine/annotations": "^1.0",
     "doctrine/doctrine-bundle": "^1.12.13 || ^2.2",
     "doctrine/dbal": "^2.7 || ^3.3",
-    "symfony/finder": "^4.4 || ^5.4 || ^6.0",
-    "symfony/framework-bundle": "^4.4 || ^5.4 || ^6.0",
-    "symfony/phpunit-bridge": "^6.0"
+    "symfony/finder": "^4.4 || ^5.4 || ^6.0 || ^7.0",
+    "symfony/framework-bundle": "^4.4 || ^5.4 || ^6.0 || ^7.0",
+    "symfony/phpunit-bridge": "^6.0 || ^7.0"
   },
   "suggest": {
     "symfony/framework-bundle": "To use the provided bundle.",
diff --git a/src/Bundle/DependencyInjection/Configuration.php b/src/Bundle/DependencyInjection/Configuration.php
index 8b597a3..339d3c2 100644
--- a/src/Bundle/DependencyInjection/Configuration.php
+++ b/src/Bundle/DependencyInjection/Configuration.php
@@ -17,7 +17,7 @@ final class Configuration implements ConfigurationInterface
     /**
      * @return TreeBuilder
      */
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('dunglas_doctrine_json_odm');