diff --git a/composer.json b/composer.json
index cab9a6b..436df03 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     }
   },
   "require": {
-    "php": ">=5.6",
+    "php": "7.1.*",
     "ext-ionCube-Loader": "*",
     "oxid-esales/oxideshop-ce": "6.0.x"
   },