diff --git a/src/Type/Definition/Config.php b/src/Type/Definition/Config.php
index 04e9983..997531c 100644
--- a/src/Type/Definition/Config.php
+++ b/src/Type/Definition/Config.php
@@ -8,6 +8,7 @@ use GraphQL\Utils\Utils;
 /**
  * Class Config
  * @package GraphQL\Type\Definition
+ * @deprecated See https://github.com/webonyx/graphql-php/issues/148 for alternatives
  */
 class Config
 {
@@ -43,7 +44,10 @@ class Config
     private static $allowCustomOptions = true;
 
     /**
+     *
      * Disables config validation
+     *
+     * @deprecated See https://github.com/webonyx/graphql-php/issues/148 for alternatives
      */
     public static function disableValidation()
     {
@@ -53,6 +57,8 @@ class Config
     /**
      * Enable deep config validation (disabled by default because it creates significant performance overhead).
      * Useful only at development to catch type definition errors quickly.
+     *
+     * @deprecated See https://github.com/webonyx/graphql-php/issues/148 for alternatives
      */
     public static function enableValidation($allowCustomOptions = true)
     {
diff --git a/tests/Type/ConfigTest.php b/tests/Type/ConfigTest.php
index 9911174..0d7d645 100644
--- a/tests/Type/ConfigTest.php
+++ b/tests/Type/ConfigTest.php
@@ -2,6 +2,7 @@
 namespace GraphQL\Tests\Type;
 
 use GraphQL\Error\InvariantViolation;
+use GraphQL\Error\Warning;
 use GraphQL\Type\Definition\Config;
 use GraphQL\Type\Definition\EnumType;
 use GraphQL\Type\Definition\InputObjectType;
@@ -14,12 +15,13 @@ class ConfigTest extends \PHPUnit_Framework_TestCase
 {
     public function setUp()
     {
-        \PHPUnit_Framework_Error_Deprecated::$enabled = false;
+        Warning::suppress(Warning::CONFIG_DEPRECATION_WARNING);
     }
 
     public static function tearDownAfterClass()
     {
         Config::disableValidation();
+        Warning::enable(Warning::CONFIG_DEPRECATION_WARNING);
     }
 
     public function testToggling()