diff --git a/README.md b/README.md
index 65143d3..ac8d6d4 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,14 @@
 [![Maintainability][ico-maintainability]][link-maintainability]
 </div>
 
+# ⚠️  THIS PACKAGE IS NO LONGER MAINTAINED
+
+It was provided open source "as is" on demand, but since we do not even use this approach in our own projects anymore, we won't make any effort to keep this up to date.
+
+Do you need help with implementing shipping estimation on the cart page for the default country? Contact info@integer-net.de with your inquiry.
+
+---
+
 # IntegerNet ShippingPreselection (AutoShipping)
 
 This module preselects the cheapest shipping method by filling shipping address with mock data and default country/region/postcode of the current storeview.
diff --git a/composer.json b/composer.json
index c271867..3ee541c 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,6 @@
 {
     "name": "integer-net/magento2-shippingpreselection",
+    "abandoned": true,
     "description": "This module provides methods to preselect a shipping method upon quote creation of the customer. It fetches all available countries from Magento Config and will preselect the default country/region/postcode of the current storeview.",
     "type": "magento2-module",
     "license": "MIT",
@@ -60,5 +61,11 @@
         "post-update-cmd": [
             "vendor/bin/phpcs --config-set installed_paths ../../magento/magento-coding-standard/"
         ]
+    },
+    "config": {
+        "allow-plugins": {
+            "magento/magento-composer-installer": true,
+            "phpro/grumphp": true
+        }
     }
 }