diff --git a/composer.json b/composer.json
index 2819ae6..2743d67 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     }
   },
   "require": {
-    "drupal/commerce": "^2",
+    "drupal/commerce": "~2.0",
     "commerceguys/authnet": "dev-master"
   }
 }
diff --git a/ludwig.json b/ludwig.json
new file mode 100644
index 0000000..945c93a
--- /dev/null
+++ b/ludwig.json
@@ -0,0 +1,8 @@
+{
+  "require": {
+    "commerceguys/authnet": {
+      "version" : "dev-master",
+      "url": "https://github.com/commerceguys/authnet/archive/master.zip"
+    }
+  }
+}