diff --git a/composer.json b/composer.json
index 8afa235..8cbd084 100644
--- a/composer.json
+++ b/composer.json
@@ -13,9 +13,15 @@
             "Deblan\\CsvValidator\\": "src/Deblan/CsvValidator/"
         }
     },
-    "minimum-stability": "stable",
+    "minimum-stability": "dev",
     "require": {
+        "php": ">=5.6.0",
         "symfony/validator": "2.*",
         "deblan/csv": "dev-master"
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1-dev"
+        }
     }
 }