diff --git a/src/Normalizer/Value/CacheableNormalization.php b/src/Normalizer/Value/CacheableNormalization.php
index 7331a89..5384222 100644
--- a/src/Normalizer/Value/CacheableNormalization.php
+++ b/src/Normalizer/Value/CacheableNormalization.php
@@ -66,28 +66,6 @@ class CacheableNormalization implements CacheableDependencyInterface {
     return $this->normalization;
   }
 
-  /**
-   * Gets an altered CacheableNormalization.
-   *
-   * @param callable $mapper
-   *   A function which receives a normalization and can add appropriate
-   *   cacheability. The first argument will be the same as
-   *   $this->getNormalization(). The second argument will be a
-   *   CacheableMetadata object to which any additional cacheability must be
-   *   added. The return value must be a valid return value for
-   *   self::getNormalization(), but it is not required to be same as the input
-   *   type.
-   *
-   * @return \Drupal\jsonapi\Normalizer\Value\CacheableNormalization
-   *   A new object, using the mapped value and any additional cacheability
-   *   provided by the callback function.
-   */
-  public function map(callable $mapper) {
-    $additional_cacheability = new CacheableMetadata();
-    $mapped = new static($this, $mapper($this->getNormalization(), $additional_cacheability));
-    return $mapped->withCacheableDependency($additional_cacheability);
-  }
-
   /**
    * Converts the object to a CacheableOmission if the normalization is empty.
    *