diff --git a/composer.json b/composer.json
index 514c41c..832c051 100644
--- a/composer.json
+++ b/composer.json
@@ -15,6 +15,7 @@
 	],
 	"require-dev": {
 		"wp-phpunit/wp-phpunit": "^5.4",
-		"yoast/phpunit-polyfills": "^1.1.0"
+		"yoast/phpunit-polyfills": "^1.1.0",
+		"doctrine/instantiator": "^1.5"
 	}
-}
\ No newline at end of file
+}
diff --git a/composer.lock b/composer.lock
index 26a429d..30ac97f 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "738b71f0f09b8ee7fa3e73c1690bd0d9",
+    "content-hash": "5bcaba0031a0606bdd17880fefc58662",
     "packages": [],
     "packages-dev": [
         {