diff --git a/composer.json b/composer.json
index a69824d..7275fdb 100644
--- a/composer.json
+++ b/composer.json
@@ -65,6 +65,7 @@
 		"php": ">=8.1",
 		"automattic/jetpack-autoloader": "^3.0",
 		"composer/installers": "^2.2",
+		"pronamic/ideal-issuers": "^1.1",
 		"pronamic/wp-datetime": "^2.1",
 		"pronamic/wp-gravityforms-nl": "^3.0",
 		"pronamic/wp-money": "^2.4",