diff --git a/.github/workflows/rector-cs.yml b/.github/workflows/rector-cs.yml
new file mode 100644
index 0000000..6424c2a
--- /dev/null
+++ b/.github/workflows/rector-cs.yml
@@ -0,0 +1,27 @@
+name: Rector + PHP CS Fixer
+
+on:
+  pull_request_target:
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - '.github/workflows/rector-cs.yml'
+      - 'composer.json'
+      - 'rector.php'
+      - '.php-cs-fixer.dist.php'
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  rector:
+    uses: yiisoft/actions/.github/workflows/rector-cs.yml@master
+    secrets:
+      token: ${{ secrets.YIISOFT_GITHUB_TOKEN }}
+    with:
+      repository: ${{ github.event.pull_request.head.repo.full_name }}
+      php: '8.1'
diff --git a/.github/workflows/rector.yml b/.github/workflows/rector.yml
deleted file mode 100644
index 36d3355..0000000
--- a/.github/workflows/rector.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-on:
-  pull_request_target:
-    paths-ignore:
-      - 'docs/**'
-      - 'README.md'
-      - 'CHANGELOG.md'
-      - '.gitignore'
-      - '.gitattributes'
-      - 'infection.json.dist'
-      - 'psalm.xml'
-
-name: rector
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  rector:
-    uses: yiisoft/actions/.github/workflows/rector.yml@master
-    secrets:
-      token: ${{ secrets.YIISOFT_GITHUB_TOKEN }}
-    with:
-      repository: ${{ github.event.pull_request.head.repo.full_name }}
-      os: >-
-        ['ubuntu-latest']
-      php: >-
-        ['8.1']
diff --git a/.gitignore b/.gitignore
index c913400..d3b3a3d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,7 @@ composer.phar
 /phpunit.phar
 /phpunit.xml
 /.phpunit.cache
+
+# PHP CS Fixer
+/.php-cs-fixer.cache
+/.php-cs-fixer.php
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
new file mode 100644
index 0000000..2477e66
--- /dev/null
+++ b/.php-cs-fixer.dist.php
@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+use PhpCsFixer\Finder;
+use PhpCsFixer\Runner\Parallel\ParallelConfigFactory;
+use Yiisoft\CodeStyle\ConfigBuilder;
+
+$finder = (new Finder())->in([
+    __DIR__ . '/src',
+    __DIR__ . '/tests',
+]);
+
+return ConfigBuilder::build()
+    ->setRiskyAllowed(true)
+    ->setParallelConfig(ParallelConfigFactory::detect())
+    ->setRules([
+        '@Yiisoft/Core' => true,
+        '@Yiisoft/Core:risky' => true,
+    ])
+    ->setFinder($finder);
diff --git a/.styleci.yml b/.styleci.yml
deleted file mode 100644
index 1ab379b..0000000
--- a/.styleci.yml
+++ /dev/null
@@ -1,85 +0,0 @@
-preset: psr12
-risky: true
-
-version: 8.1
-
-finder:
-  exclude:
-    - docs
-    - vendor
-
-enabled:
-  - alpha_ordered_traits
-  - array_indentation
-  - array_push
-  - combine_consecutive_issets
-  - combine_consecutive_unsets
-  - combine_nested_dirname
-  - declare_strict_types
-  - dir_constant
-  - fully_qualified_strict_types
-  - function_to_constant
-  - hash_to_slash_comment
-  - is_null
-  - logical_operators
-  - magic_constant_casing
-  - magic_method_casing
-  - method_separation
-  - modernize_types_casting
-  - native_function_casing
-  - native_function_type_declaration_casing
-  - no_alias_functions
-  - no_empty_comment
-  - no_empty_phpdoc
-  - no_empty_statement
-  - no_extra_block_blank_lines
-  - no_short_bool_cast
-  - no_superfluous_elseif
-  - no_unneeded_control_parentheses
-  - no_unneeded_curly_braces
-  - no_unneeded_final_method
-  - no_unset_cast
-  - no_unused_imports
-  - no_unused_lambda_imports
-  - no_useless_else
-  - no_useless_return
-  - normalize_index_brace
-  - php_unit_dedicate_assert
-  - php_unit_dedicate_assert_internal_type
-  - php_unit_expectation
-  - php_unit_mock
-  - php_unit_mock_short_will_return
-  - php_unit_namespaced
-  - php_unit_no_expectation_annotation
-  - phpdoc_no_empty_return
-  - phpdoc_no_useless_inheritdoc
-  - phpdoc_order
-  - phpdoc_property
-  - phpdoc_scalar
-  - phpdoc_singular_inheritdoc
-  - phpdoc_trim
-  - phpdoc_trim_consecutive_blank_line_separation
-  - phpdoc_type_to_var
-  - phpdoc_types
-  - phpdoc_types_order
-  - print_to_echo
-  - regular_callable_call
-  - return_assignment
-  - self_accessor
-  - self_static_accessor
-  - set_type_to_cast
-  - short_array_syntax
-  - short_list_syntax
-  - simplified_if_return
-  - single_quote
-  - standardize_not_equals
-  - ternary_to_null_coalescing
-  - trailing_comma_in_multiline_array
-  - unalign_double_arrow
-  - unalign_equals
-  - empty_loop_body_braces
-  - integer_literal_case
-  - union_type_without_spaces
-
-disabled:
-  - function_declaration
diff --git a/composer.json b/composer.json
index c4ca2ca..820711b 100644
--- a/composer.json
+++ b/composer.json
@@ -42,6 +42,7 @@
         "roave/infection-static-analysis-plugin": "^1.35",
         "vimeo/psalm": "^5.26.1 || ^6.14.3",
         "vlucas/phpdotenv": "^5.6.2",
+        "yiisoft/code-style": "^1.0",
         "yiisoft/db-mssql": "^2.0",
         "yiisoft/db-mysql": "^2.0",
         "yiisoft/db-oracle": "^2.0",
@@ -78,6 +79,7 @@
     },
     "scripts": {
         "psalm": "psalm",
-        "test": "phpunit --testdox --no-interaction"
+        "test": "phpunit --testdox --no-interaction",
+        "cs-fix": "php-cs-fixer fix"
     }
 }
diff --git a/src/DbSchemaManager.php b/src/DbSchemaManager.php
index ebe5f4e..5a8c25f 100644
--- a/src/DbSchemaManager.php
+++ b/src/DbSchemaManager.php
@@ -17,9 +17,7 @@
  */
 final class DbSchemaManager
 {
-    public function __construct(private ConnectionInterface $db)
-    {
-    }
+    public function __construct(private ConnectionInterface $db) {}
 
     /**
      * Ensures that the translator tables exists in the database.
diff --git a/src/MessageSource.php b/src/MessageSource.php
index 16d3e66..bb83171 100644
--- a/src/MessageSource.php
+++ b/src/MessageSource.php
@@ -38,12 +38,11 @@ final class MessageSource implements MessageReaderInterface, MessageWriterInterf
 
     public function __construct(
         private ConnectionInterface $db,
-        private CacheInterface|null $cache = null,
+        private ?CacheInterface $cache = null,
         private string $sourceMessageTable = '{{%yii_source_message}}',
         private string $messageTable = '{{%yii_message}}',
-        private int $cachingDuration = 3600
-    ) {
-    }
+        private int $cachingDuration = 3600,
+    ) {}
 
     /**
      * @throws Exception
@@ -51,7 +50,7 @@ public function __construct(
      * @throws InvalidConfigException
      * @throws Throwable
      */
-    public function getMessage(string $id, string $category, string $locale, array $parameters = []): string|null
+    public function getMessage(string $id, string $category, string $locale, array $parameters = []): ?string
     {
         if (!isset($this->messages[$category][$locale])) {
             $this->messages[$category][$locale] = $this->read($category, $locale);
@@ -162,8 +161,8 @@ private function read(string $category, string $locale): array
             /** @psalm-var array<string, array<string, string>> */
             return $this->cache->getOrSet(
                 $this->getCacheKey($category, $locale),
-                fn (): array => $this->readFromDb($category, $locale),
-                $this->cachingDuration
+                fn(): array => $this->readFromDb($category, $locale),
+                $this->cachingDuration,
             );
         }
 
@@ -185,7 +184,7 @@ private function readFromDb(string $category, string $locale): array
             ->from(['ts' => $this->sourceMessageTable])
             ->innerJoin(
                 ['td' => $this->messageTable],
-                ['td.id' => new ColumnName('ts.id')]
+                ['td.id' => new ColumnName('ts.id')],
             )
             ->where([
                 'locale' => $locale,
@@ -195,7 +194,7 @@ private function readFromDb(string $category, string $locale): array
             ->all();
 
         return array_map(
-            static fn (array $message): array => empty($message['comment'])
+            static fn(array $message): array => empty($message['comment'])
                 ? ['message' => $message['translation']]
                 : [
                     'message' => $message['translation'],
diff --git a/tests/Common/AbstractMessageSourceTest.php b/tests/Common/AbstractMessageSourceTest.php
index eb11627..0ecc5b4 100644
--- a/tests/Common/AbstractMessageSourceTest.php
+++ b/tests/Common/AbstractMessageSourceTest.php
@@ -84,13 +84,12 @@ public function testMultiWrite(): void
             $messageSource->write($category, $locale, $data);
         }
 
-
         foreach ($allData as $fileData) {
             [$category, $locale, $data] = $fileData;
             foreach ($data as $messageId => $messageData) {
                 $this->assertEquals(
                     $messageData['message'],
-                    $messageSource->getMessage($messageId, $category, $locale)
+                    $messageSource->getMessage($messageId, $category, $locale),
                 );
             }
         }
diff --git a/tests/Common/AbstractSQLDumpFileTest.php b/tests/Common/AbstractSQLDumpFileTest.php
index e73fed2..7e21d72 100644
--- a/tests/Common/AbstractSQLDumpFileTest.php
+++ b/tests/Common/AbstractSQLDumpFileTest.php
@@ -12,6 +12,8 @@
 use Yiisoft\Db\Exception\Exception;
 use Yiisoft\Db\Exception\InvalidConfigException;
 
+use function dirname;
+
 /**
  * @group Mssql
  */
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 3e174c3..0fcc416 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-require dirname(__DIR__) . '/vendor/autoload.php';
+require \dirname(__DIR__) . '/vendor/autoload.php';
 
 if (getenv('ENVIRONMENT', local_only: true) !== 'ci') {
     $dotenv = Dotenv\Dotenv::createUnsafeImmutable(__DIR__);