diff --git a/composer.json b/composer.json
index 0fc4d4e..8b70287 100644
--- a/composer.json
+++ b/composer.json
@@ -15,14 +15,14 @@
         "ibexa/graphql": "~5.0.x-dev",
         "ibexa/rector": "~5.0.x-dev",
         "ibexa/rest": "~5.0.x-dev",
-        "psr/log": "^1.1",
-        "symfony/dependency-injection": "^6.4",
-        "symfony/event-dispatcher": "^6.4",
-        "symfony/expression-language": "^6.4",
-        "symfony/framework-bundle": "^6.4",
-        "symfony/http-kernel": "^6.4",
-        "symfony/translation": "^6.4",
-        "symfony/yaml": "^6.4"
+        "psr/log": "^3.0",
+        "symfony/dependency-injection": "^7.2",
+        "symfony/event-dispatcher": "^7.2",
+        "symfony/expression-language": "^7.2",
+        "symfony/framework-bundle": "^7.2",
+        "symfony/http-kernel": "^7.2",
+        "symfony/translation": "^7.2",
+        "symfony/yaml": "^7.2"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/lib/FieldType/Mapper/ParametersTransformer.php b/src/lib/FieldType/Mapper/ParametersTransformer.php
index c5964cc..c302e21 100644
--- a/src/lib/FieldType/Mapper/ParametersTransformer.php
+++ b/src/lib/FieldType/Mapper/ParametersTransformer.php
@@ -15,7 +15,7 @@
  */
 final class ParametersTransformer implements DataTransformerInterface
 {
-    public function transform($value)
+    public function transform($value): ?string
     {
         if ($value === null) {
             return null;
@@ -24,7 +24,7 @@ public function transform($value)
         return Yaml::dump($value, 2, 4);
     }
 
-    public function reverseTransform($value)
+    public function reverseTransform($value): mixed
     {
         if ($value === null) {
             return null;