diff --git a/composer.json b/composer.json
index 62bb26f..c5643c8 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,10 @@
         "gammadia/functional-collections": "^0.1",
         "webmozart/assert": "^1.10"
     },
+    "require-dev": {
+        "doctrine/dbal": "^3.0",
+        "symfony/serializer": "^5.3"
+    },
     "autoload": {
         "psr-4": {
             "Gammadia\\DateTimeExtra\\": "src"