diff --git a/composer.json b/composer.json
index 1ec5626..076be02 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
   },
   "require": {
     "guzzlehttp/guzzle": "^6.3.3",
-    "netresearch/jsonmapper": "^1.4"
+    "netresearch/jsonmapper": "^5.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^9.0"