diff --git a/autoslug.info.yml b/autoslug.info.yml
index c818ed8..555a9ff 100644
--- a/autoslug.info.yml
+++ b/autoslug.info.yml
@@ -3,5 +3,7 @@ type: module
 package: Kirjastot.fi
 description: Generate SEO URLs for content automaticly
 core: 8.x
+core_version_requirement: ">=8"
 configure: entity.autoslug_rule.collection
-dependencies: { }
+dependencies:
+  - drupal:path
diff --git a/autoslug.services.yml b/autoslug.services.yml
index 0540c8f..98f0c86 100644
--- a/autoslug.services.yml
+++ b/autoslug.services.yml
@@ -4,7 +4,7 @@ services:
     arguments: ['@config.factory']
   autoslug.alias_generator:
     class: Drupal\autoslug\AliasGenerator
-    arguments: ['@path.alias_storage']
+    arguments: ['@entity_type.manager', '@path_alias.repository']
     tags:
       - { name: service_collector, tag: autoslug_slugger, call: addSlugger }
   autoslug.slugger.default:
diff --git a/src/AliasGenerator.php b/src/AliasGenerator.php
index 940fd6d..121a9e8 100644
--- a/src/AliasGenerator.php
+++ b/src/AliasGenerator.php
@@ -4,14 +4,17 @@
 
 use SplPriorityQueue;
 use Drupal\Core\Entity\EntityInterface;
-use Drupal\Core\Path\AliasStorageInterface;
+use Drupal\path_alias\AliasRepositoryInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
 
 class AliasGenerator {
   protected $aliasStorage;
+  protected $aliasRepository;
   protected $sluggers;
 
-  public function __construct(AliasStorageInterface $alias_storage) {
-    $this->aliasStorage = $alias_storage;
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, AliasRepositoryInterface $alias_repository) {
+    $this->aliasStorage = $entity_type_manager->getStorage('path_alias');
+    $this->aliasRepository = $alias_repository;
     $this->sluggers = new SplPriorityQueue;
   }
 
@@ -21,8 +24,8 @@ public function addSlugger(SluggerInterface $slugger, $priority = 0) {
 
   public function fetchExistingAlias(EntityInterface $entity) {
     $langcode = $entity->language()->getId();
-    $cache_key = '/' . $entity->urlInfo()->getInternalPath();
-    $match = $this->aliasStorage->lookupPathAlias($cache_key, $langcode);
+    $cache_key = '/' . $entity->toUrl()->getInternalPath();
+    $match = $this->aliasRepository->lookupBySystemPath($cache_key, $langcode);
     return $match;
   }
 
@@ -37,8 +40,13 @@ public function createAlias(EntityInterface $entity, $force = FALSE) {
           $langcode = $entity->language()->getId();
           $alias = $slugger->build($entity);
           $alias = $this->ensureAliasUnique($alias, $langcode);
-          $cache_key = '/' . $entity->urlInfo()->getInternalPath();
-          $this->aliasStorage->save($cache_key, $alias, $langcode);
+          $cache_key = '/' . $entity->toUrl()->getInternalPath();
+          $alias = $this->aliasStorage->create([
+            'path' => $cache_key,
+            'alias' => $alias,
+            'langcode' => $langcode
+          ]);
+          $alias->save();
           return TRUE;
         }
       }
@@ -55,7 +63,7 @@ public function createAllAliases(EntityInterface $entity) {
 
   public function ensureAliasUnique($base, $langcode) {
     $alias = $base;
-    for ($i = 1; $this->aliasStorage->lookupPathSource($alias, $langcode); $i++) {
+    for ($i = 1; $this->aliasRepository->lookupByAlias($alias, $langcode); $i++) {
       $alias = implode('-', [$base, $i]);
     }
     return $alias;
diff --git a/src/Controller/SlugController.php b/src/Controller/SlugController.php
index 9e38655..9450dd7 100644
--- a/src/Controller/SlugController.php
+++ b/src/Controller/SlugController.php
@@ -31,7 +31,7 @@ public function __construct(EntityTypeManagerInterface $entity_manager, RequestS
   }
 
   public function aliases($type) {
-    list($entity_type, $bundle) = explode('.', $type . '.');
+    [$entity_type, $bundle] = explode('.', $type . '.');
     $storage = $this->entityManager->getStorage($entity_type);
 
     $iterator = new TimeLimitedIterator(function($first, $count) use ($storage, $bundle) {
@@ -43,6 +43,8 @@ public function aliases($type) {
         $query->condition($storage->getEntityType()->getKey('bundle'), $bundle);
       }
 
+      $query->accessCheck(TRUE); // Added this line to specify access check
+
       if ($result = $query->execute()) {
         return $storage->loadMultiple($result);
       }
diff --git a/src/Form/RuleForm.php b/src/Form/RuleForm.php
index 9e148d8..fa83655 100644
--- a/src/Form/RuleForm.php
+++ b/src/Form/RuleForm.php
@@ -71,7 +71,7 @@ public function save(array $form, FormStateInterface $form_state) {
     parent::save($form, $form_state);
     $form_state->setRedirect('entity.autoslug_rule.collection');
 
-    drupal_set_message($this->t('New path alias rule was created.'));
+    $this->messenger()->addStatus($this->t('New path alias rule was created.'));
   }
 
   protected function getEntityTypeOptions() {
@@ -79,7 +79,7 @@ protected function getEntityTypeOptions() {
     $options = [];
 
     foreach ($types as $type) {
-      if ($type->isSubClassOf(ContentEntityInterface::class)) {
+      if ($type->entityClassImplements(ContentEntityInterface::class)) {
         $options[$type->id()] = (string)$type->getLabel();
       }
     }
@@ -94,7 +94,7 @@ protected function getBundleOptions() {
     $options = [];
 
     foreach ($types as $type) {
-      if ($type->isSubClassOf(ContentEntityInterface::class) && $type->getBundleEntityType()) {
+      if ($type->entityClassImplements(ContentEntityInterface::class) && $type->getBundleEntityType()) {
         $bundles = $this->entityTypeManager->getStorage($type->getBundleEntityType())->loadMultiple();
         $group = (string)$type->getLabel();
 
diff --git a/src/RuleListBuilder.php b/src/RuleListBuilder.php
index cd8594f..6fc1d7f 100644
--- a/src/RuleListBuilder.php
+++ b/src/RuleListBuilder.php
@@ -10,18 +10,18 @@
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 class RuleListBuilder extends EntityListBuilder {
-  protected $entityManager;
+  protected $entityTypeManager;
 
   public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
     return new static(
-      $container->get('entity.manager'),
+      $container->get('entity_type.manager'),
       $entity_type
     );
   }
 
-  public function __construct(EntityTypeManagerInterface $entity_manager, EntityTypeInterface $entity_type) {
-    parent::__construct($entity_type, $entity_manager->getStorage($entity_type->id()));
-    $this->entityManager = $entity_manager;
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityTypeInterface $entity_type) {
+    parent::__construct($entity_type, $entity_type_manager->getStorage($entity_type->id()));
+    $this->entityTypeManager = $entity_type_manager;
   }
 
   public function buildHeader() {
@@ -48,15 +48,15 @@ public function buildRow(EntityInterface $entity) {
   }
 
   protected function entityTypeLabel($type_id) {
-    return $this->entityManager->getDefinition($type_id)->getLabel();
-    
+    return $this->entityTypeManager->getDefinition($type_id)->getLabel();
+
     // $label = $this->entityManager->getDefinition($type_id)->getLabel();
     // return new FormattableMarkup('@label (@type)', ['@label' => $label, '@type' => $type_id]);
   }
 
   protected function entityBundleLabel($type_id, $bundle_id) {
-    $bundle_type = $this->entityManager->getDefinition($type_id)->getBundleEntityType();
-    $label = $this->entityManager->getStorage($bundle_type)->load($bundle_id)->label();
+    $bundle_type = $this->entityTypeManager->getDefinition($type_id)->getBundleEntityType();
+    $label = $this->entityTypeManager->getStorage($bundle_type)->load($bundle_id)->label();
     return $label;
 
     // $bundle_type = $this->entityManager->getDefinition($type_id)->getBundleEntityType();
diff --git a/src/Slugger/DefaultSlugger.php b/src/Slugger/DefaultSlugger.php
index a248f8d..4bf3ff4 100644
--- a/src/Slugger/DefaultSlugger.php
+++ b/src/Slugger/DefaultSlugger.php
@@ -58,7 +58,7 @@ protected function extractTokens(EntityInterface $entity, $pattern, $max_words =
       $key = $match[2];
 
       if (strpos($key, ':')) {
-        list($child, $key) = explode(':', $key);
+        [$child, $key] = explode(':', $key);
         $value = $entity->get($child)->entity->get($key)->value;
       } else {
         $value = $entity->get($key)->value;
@@ -80,7 +80,7 @@ protected function extractTokens(EntityInterface $entity, $pattern, $max_words =
    * Replace tokens from the URL pattern.
    */
   protected function processPattern($pattern, array $tokens) {
-    $keys = array_map(function($t) { return sprintf('{%s}', $t); }, array_keys($tokens));
+    $keys = array_map(fn($t) => sprintf('{%s}', $t), array_keys($tokens));
     $alias = str_replace($keys, array_values($tokens), $pattern);
     $alias = Unicode::truncate($alias, 128, TRUE);
     return $alias;
diff --git a/src/Slugger/DeprecatedConfigBasedSlugger.php b/src/Slugger/DeprecatedConfigBasedSlugger.php
index 6e96582..7020103 100644
--- a/src/Slugger/DeprecatedConfigBasedSlugger.php
+++ b/src/Slugger/DeprecatedConfigBasedSlugger.php
@@ -46,7 +46,7 @@ public function aliasByPattern(EntityInterface $entity, $pattern) {
     $replace_match = function(array $matches) use ($entity) {
       $prop = $matches[1];
       if (strpos($prop, ':')) {
-        list($child, $prop) = explode(':', $prop);
+        [$child, $prop] = explode(':', $prop);
         $value = $entity->get($child)->entity->get($prop)->value;
       } else {
         $value = $entity->get($prop)->value;
diff --git a/src/TimeLimitedIterator.php b/src/TimeLimitedIterator.php
index 48e8e34..ff9c2f7 100644
--- a/src/TimeLimitedIterator.php
+++ b/src/TimeLimitedIterator.php
@@ -32,14 +32,14 @@ public function next() {
   }
 
   public function key() {
-    return $this->i < count($this->data) ? $this->i : FALSE;
+    return $this->i < (is_countable($this->data) ? count($this->data) : 0) ? $this->i : FALSE;
   }
 
   public function valid() {
-    if ($this->i >= count($this->data)) {
+    if ($this->i >= (is_countable($this->data) ? count($this->data) : 0)) {
       $this->fetchMore();
     }
-    return $this->i < count($this->data);
+    return $this->i < (is_countable($this->data) ? count($this->data) : 0);
   }
 
   public function rewind() {