diff --git a/composer.json b/composer.json
index 29e3340..5bd20e3 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,7 @@
   },
   "require": {
     "php": "^7.0",
-    "oxid-esales/oxideshop-ce": "6.3 - 6.5",
+    "oxid-esales/oxideshop-ce": "6.3 - 6.6",
     "spipu/html2pdf": "^5.2"
   },
   "autoload": {