diff --git a/core/core.libraries.yml b/core/core.libraries.yml
index 7c388089f0..f90cc9ac52 100644
--- a/core/core.libraries.yml
+++ b/core/core.libraries.yml
@@ -105,7 +105,11 @@ drupal.announce:
     - core/drupal.debounce
 
 awesomplete:
-  version: VERSION
+  version: 1.1.5
+  license:
+    name: MIT
+    url: https://github.com/LeaVerou/awesomplete/blob/gh-pages/LICENSE
+    gpl-compatible: true
   js:
     assets/vendor/awesomplete/awesomplete.js: {}
   css:
@@ -479,6 +483,21 @@ jquery.ui.accordion:
     - core/jquery.ui
     - core/jquery.ui.widget
 
+jquery.ui.autocomplete:
+  version: *jquery_ui_version
+  license: *jquery_ui_license
+  js:
+    assets/vendor/jquery.ui/ui/widgets/autocomplete-min.js: { minified: true }
+  css:
+    component:
+      assets/vendor/jquery.ui/themes/base/autocomplete.css: {}
+  dependencies:
+    - core/jquery.ui
+    - core/jquery.ui.widget
+    - core/jquery.ui.position
+    - core/jquery.ui.menu
+  deprecated: The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/project/drupal/issues/3076171
+
 jquery.ui.button:
   version: *jquery_ui_version
   license: *jquery_ui_license
diff --git a/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php b/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php
index 2e2464cd29..9fb5330928 100644
--- a/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php
+++ b/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php
@@ -142,7 +142,7 @@ public static function processEntityAutocomplete(array &$element, FormStateInter
       'selection_settings_key' => $selection_settings_key,
     ];
 
-    // Create attribute that will be used for client side enforcement of field
+    // Create attribute that will be used for client-side enforcement of field
     // cardinality.
     $name = explode('[', $element['#name'])[0];
     if (!empty($complete_form[$name]['widget']['#theme']) && $complete_form[$name]['widget']['#theme'] === 'field_multiple_value_form') {
diff --git a/core/misc/autocomplete.es6.js b/core/misc/autocomplete.es6.js
index 3cccc758e6..8c774d1e34 100644
--- a/core/misc/autocomplete.es6.js
+++ b/core/misc/autocomplete.es6.js
@@ -58,7 +58,7 @@
   const extractLastTerm = terms => autocomplete.splitValues(terms).pop();
 
   /**
-   * Detemines if a suggestion should be an available option.
+   * Determines if a suggestion should be an available option.
    * Does not use arrow syntax so there is access to Awesomplete's this object.
    * @param {object} suggestion
    *   A suggestion based on user input. It is an object with label and value
@@ -66,22 +66,25 @@
    * @param {string} input
    *   The text entered in the input field.
    *
-   * @return {bool}
+   * @return {boolean}
    *   If the suggestion should be displayed in the results.
    */
   function filterResults(suggestion, input) {
     const { options } = Drupal.autocomplete;
     const inputElement = this.input;
-    const cardinality = inputElement
-      .closest('[data-autocomplete-cardinality]')
-      .getAttribute('data-autocomplete-cardinality');
+    const inputWrapper = inputElement.closest(
+      '[data-autocomplete-cardinality]',
+    );
+    const cardinality = inputWrapper
+      ? inputWrapper.getAttribute('data-autocomplete-cardinality')
+      : -1;
     const suggestionValue = suggestion.value;
     const currentValues = autocomplete.splitValues(input);
 
-    const inputSpecificFirstCharBlacklist = inputElement.hasAttribute(
-      'data-autocomplete-first-character-blacklist',
+    const inputSpecificFirstCharDenylist = inputElement.hasAttribute(
+      'data-autocomplete-first-character-denylist',
     )
-      ? inputElement.getAttribute('data-autocomplete-first-character-blacklist')
+      ? inputElement.getAttribute('data-autocomplete-first-character-denylist')
       : '';
 
     // Prevent suggestions if the maximum number of items is reached.
@@ -89,10 +92,10 @@
       return false;
     }
 
-    // Prevent suggestions if the first input character is in the blacklist.
+    // Prevent suggestions if the first input character is in the denylist.
     if (
-      options.firstCharacterBlacklist.indexOf(input[0]) !== -1 ||
-      inputSpecificFirstCharBlacklist.indexOf(input[0]) !== -1
+      options.firstCharacterDenylist.indexOf(input[0]) !== -1 ||
+      inputSpecificFirstCharDenylist.indexOf(input[0]) !== -1
     ) {
       return false;
     }
@@ -194,7 +197,7 @@
         });
 
         // Add class previously added by jQueryUI for backwards compatibility.
-        autocompleteElement.classList.add('awesomplete-input');
+        autocompleteElement.classList.add('ui-autocomplete-input');
 
         // Change role to textbox, Awesomplete defaults to combobox. The
         // screenreader instructions for combobox assume select options are
@@ -231,7 +234,7 @@
             if (autocomplete.cache[inputId].hasOwnProperty(term)) {
               awesomplete.list = autocomplete.cache[inputId][term];
               awesomplete.evaluate();
-              readResults(autocomplete.cache[inputId][term].length);
+              readResults(awesomplete.ul.children.length);
             } else {
               const apiUrl = input.getAttribute('data-autocomplete-path');
               const xhr = new XMLHttpRequest();
@@ -284,7 +287,7 @@
       replace: replaceInputValue,
       sort: false,
       minChars: 1,
-      firstCharacterBlacklist: ',',
+      firstCharacterDenylist: ',',
       autoFirst: false,
       maxItems: 10,
     },
diff --git a/core/misc/autocomplete.js b/core/misc/autocomplete.js
index a293da98fe..0fc61c10b8 100644
--- a/core/misc/autocomplete.js
+++ b/core/misc/autocomplete.js
@@ -43,17 +43,18 @@
     var options = Drupal.autocomplete.options;
 
     var inputElement = this.input;
-    var cardinality = inputElement.closest('[data-autocomplete-cardinality]').getAttribute('data-autocomplete-cardinality');
+    var inputWrapper = inputElement.closest('[data-autocomplete-cardinality]');
+    var cardinality = inputWrapper ? inputWrapper.getAttribute('data-autocomplete-cardinality') : -1;
     var suggestionValue = suggestion.value;
     var currentValues = autocomplete.splitValues(input);
 
-    var inputSpecificFirstCharBlacklist = inputElement.hasAttribute('data-autocomplete-first-character-blacklist') ? inputElement.getAttribute('data-autocomplete-first-character-blacklist') : '';
+    var inputSpecificFirstCharDenylist = inputElement.hasAttribute('data-autocomplete-first-character-denylist') ? inputElement.getAttribute('data-autocomplete-first-character-denylist') : '';
 
     if (cardinality > 0 && currentValues.length > cardinality) {
       return false;
     }
 
-    if (options.firstCharacterBlacklist.indexOf(input[0]) !== -1 || inputSpecificFirstCharBlacklist.indexOf(input[0]) !== -1) {
+    if (options.firstCharacterDenylist.indexOf(input[0]) !== -1 || inputSpecificFirstCharDenylist.indexOf(input[0]) !== -1) {
       return false;
     }
 
@@ -107,7 +108,7 @@
           replace: options.replace
         });
 
-        autocompleteElement.classList.add('awesomplete-input');
+        autocompleteElement.classList.add('ui-autocomplete-input');
 
         autocompleteElement.setAttribute('role', 'textbox');
 
@@ -131,7 +132,7 @@
             if (autocomplete.cache[inputId].hasOwnProperty(term)) {
               awesomplete.list = autocomplete.cache[inputId][term];
               awesomplete.evaluate();
-              readResults(autocomplete.cache[inputId][term].length);
+              readResults(awesomplete.ul.children.length);
             } else {
               var apiUrl = input.getAttribute('data-autocomplete-path');
               var xhr = new XMLHttpRequest();
@@ -170,7 +171,7 @@
       replace: replaceInputValue,
       sort: false,
       minChars: 1,
-      firstCharacterBlacklist: ',',
+      firstCharacterDenylist: ',',
       autoFirst: false,
       maxItems: 10
     }
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
index b9e1a389d8..bede3bcbb5 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
@@ -69,7 +69,7 @@ public function testEntityReferenceAutocompleteWidget() {
     $page = $this->getSession()->getPage();
     $assert_session = $this->assertSession();
 
-    $autocomplete_field = $assert_session->waitForElement('css', '[name="' . $field_name . '[0][target_id]"].awesomplete-input');
+    $autocomplete_field = $assert_session->waitForElement('css', '[name="' . $field_name . '[0][target_id]"].ui-autocomplete-input');
     $autocomplete_field->setValue('Test');
     $this->getSession()->getDriver()->keyDown($autocomplete_field->getXpath(), ' ');
     $assert_session->waitOnAutocomplete();
@@ -93,7 +93,7 @@ public function testEntityReferenceAutocompleteWidget() {
     $this->drupalGet('node/add/page');
     $page = $this->getSession()->getPage();
 
-    $autocomplete_field = $assert_session->waitForElement('css', '[name="' . $field_name . '[0][target_id]"].awesomplete-input');
+    $autocomplete_field = $assert_session->waitForElement('css', '[name="' . $field_name . '[0][target_id]"].ui-autocomplete-input');
     $autocomplete_field->setValue('Test');
     $this->getSession()->getDriver()->keyDown($autocomplete_field->getXpath(), ' ');
     $assert_session->waitOnAutocomplete();