diff --git a/composer.json b/composer.json
index eafdbe4..5cf8f6f 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,8 @@
     "horstoeko/zugferd": "^1.0",
     "vlucas/phpdotenv": "^5.6",
     "horstoeko/zugferdvisualizer": "^1.0",
-    "ajgl/composer-symlinker": "^0.2.5"
+    "ajgl/composer-symlinker": "^0.2.5",
+    "guzzlehttp/guzzle": "^7"
   },
   "repositories": [
   ],