diff --git a/composer.json b/composer.json
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
   ],
   "require": {
     "php": ">=7.3.0",
-    "netresearch/jsonmapper": "^1.1.1",
+    "netresearch/jsonmapper": "^4.1.0",
     "vlucas/phpdotenv": "^2.4"
   },
   "require-dev": {