diff -u b/config_readonly.services.yml b/config_readonly.services.yml
--- b/config_readonly.services.yml
+++ b/config_readonly.services.yml
@@ -8 +8 @@
-    arguments: ["@serialization.yaml", "@config.factory"]
+    arguments: ["@config.factory"]
diff -u b/src/ConfigReadonlyExceptionsServiceProvider.php b/src/ConfigReadonlyExceptionsServiceProvider.php
--- b/src/ConfigReadonlyExceptionsServiceProvider.php
+++ b/src/ConfigReadonlyExceptionsServiceProvider.php
@@ -20,13 +20,6 @@
   protected $configFactory;
 
   /**
-   * Drupal\Component\Serialization\Yaml definition.
-   *
-   * @var \Drupal\Component\Serialization\Yaml
-   */
-  protected $yaml;
-
-  /**
    * An array to store the active config exceptions settings.
    *
    * @var array
@@ -53,9 +46,8 @@
    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
    *   The factory for configuration objects.
    */
-  public function __construct(Yaml $serialization_yaml, ConfigFactoryInterface $config_factory) {
+  public function __construct(ConfigFactoryInterface $config_factory) {
     $this->configFactory = $config_factory;
-    $this->yaml = $serialization_yaml;
     $this->config = $this->configFactory->get('config_readonly.config_readonly_exceptions');
   }
 
@@ -142,7 +134,7 @@
       if ($string = file_get_contents($ignore_file)) {
         $parsed = FALSE;
         try {
-          $parsed = $this->yaml::decode($string);
+          $parsed = Yaml::decode($string);
         }
         catch (InvalidDataTypeException $e) {
           $this->setError('Unable to parse the drush config ignore file.');
@@ -244,11 +236,8 @@
 
     // Check for matches.
     $patterns = $this->getExceptionPatterns();
-    dpm($patterns);
-    dpm($name);
     if ($patterns) {
       foreach ($patterns as $pattern) {
-        dpm($pattern . ' : ' . (preg_match($pattern, $name) ? 'yes' : 'no'));
         if (preg_match($pattern, $name)) {
           return TRUE;
         }