diff --git a/composer.json b/composer.json
index c8dc2b6..6b0219d 100644
--- a/composer.json
+++ b/composer.json
@@ -26,6 +26,7 @@
         "allow-plugins": {
             "composer/package-versions-deprecated": true,
             "simplesamlphp/composer-module-installer": true,
+            "simplesamlphp/composer-xmlprovider-installer": true,
             "dealerdirect/phpcodesniffer-composer-installer": true,
             "phpstan/extension-installer": true
         }