diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 6e498a6..e99d1c2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -13,15 +13,21 @@ jobs:
                 php:
                     - '8.1'
                     - '8.2'
+                    - '8.3'
                 dependency:
                     - ''
                 symfony:
                     - '5.4.*'
-                    - '6.2.*'
+                    - '6.3.*'
+                    - '6.4.*'
+                    - '7.0.*'
                 include:
                     - php: '8.1'
                       symfony: '5.4.*'
                       dependency: 'lowest'
+                exclude:
+                    - php: '8.1'
+                      symfony: '7.0.*'
             fail-fast: false
         steps:
             - name: Checkout
diff --git a/Tests/Partial/Fixtures/ConfigurationStub.php b/Tests/Partial/Fixtures/ConfigurationStub.php
index 37366a6..3eb1b47 100644
--- a/Tests/Partial/Fixtures/ConfigurationStub.php
+++ b/Tests/Partial/Fixtures/ConfigurationStub.php
@@ -7,7 +7,7 @@
 
 class ConfigurationStub implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('root');
         $root = $treeBuilder->getRootNode();
diff --git a/Tests/PhpUnit/Fixtures/AlwaysValidConfiguration.php b/Tests/PhpUnit/Fixtures/AlwaysValidConfiguration.php
index e6e68b9..0d94596 100644
--- a/Tests/PhpUnit/Fixtures/AlwaysValidConfiguration.php
+++ b/Tests/PhpUnit/Fixtures/AlwaysValidConfiguration.php
@@ -7,7 +7,7 @@
 
 class AlwaysValidConfiguration implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         return new TreeBuilder('root');
     }
diff --git a/Tests/PhpUnit/Fixtures/ConfigurationWithMultipleArrayKeys.php b/Tests/PhpUnit/Fixtures/ConfigurationWithMultipleArrayKeys.php
index 2dc091c..ddd14b7 100644
--- a/Tests/PhpUnit/Fixtures/ConfigurationWithMultipleArrayKeys.php
+++ b/Tests/PhpUnit/Fixtures/ConfigurationWithMultipleArrayKeys.php
@@ -7,7 +7,7 @@
 
 class ConfigurationWithMultipleArrayKeys implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('root');
         $root = $treeBuilder->getRootNode();
diff --git a/Tests/PhpUnit/Fixtures/ConfigurationWithRequiredValue.php b/Tests/PhpUnit/Fixtures/ConfigurationWithRequiredValue.php
index b373ecd..6fe37ef 100644
--- a/Tests/PhpUnit/Fixtures/ConfigurationWithRequiredValue.php
+++ b/Tests/PhpUnit/Fixtures/ConfigurationWithRequiredValue.php
@@ -7,7 +7,7 @@
 
 class ConfigurationWithRequiredValue implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('root');
         $root = $treeBuilder->getRootNode();
diff --git a/composer.json b/composer.json
index 088fa43..bb8940f 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     ],
     "require": {
         "php": "^8.1",
-        "symfony/config": "^5.4 || ^6.2"
+        "symfony/config": "^5.4 || ^6.2 || ^7.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.6 || ^10.0"
@@ -33,5 +33,7 @@
         "branch-alias": {
             "dev-master": "5.0.x-dev"
         }
-    }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
 }