diff --git a/composer.json b/composer.json
index bc679e0..b4cdef0 100644
--- a/composer.json
+++ b/composer.json
@@ -34,9 +34,10 @@
         }
     },
     "config": {
-        "preferred-install": "dist",
         "sort-packages": true,
-        "optimize-autoloader": true
+        "platform": {
+            "php": "7.1.99"
+        }
     },
     "scripts": {
         "test": "phpunit",