diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 59114f6..7054c1a 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -145,71 +145,21 @@ parameters:
 			count: 1
 			path: test/functional/Resource/AccountTest.php
 
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\AccountTest\\:\\:testAccount\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/AccountTest.php
-
 		-
 			message: "#^Call to an undefined method Seafile\\\\Client\\\\Type\\\\Library\\:\\:decrypt\\(\\)\\.$#"
 			count: 1
 			path: test/functional/Resource/FileTest.php
 
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\FileTest\\:\\:testCreate\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/FileTest.php
-
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\FileTest\\:\\:testHistory\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/FileTest.php
-
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\FileTest\\:\\:testList\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/FileTest.php
-
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\FileTest\\:\\:testRename\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/FileTest.php
-
-		-
-			message: "#^Property Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\FileTest\\:\\:\\$libraryResource \\(Seafile\\\\Client\\\\Resource\\\\Library\\|null\\) does not accept Seafile\\\\Client\\\\Type\\\\Library\\.$#"
-			count: 1
-			path: test/functional/Resource/FileTest.php
-
 		-
 			message: "#^Result of && is always false\\.$#"
 			count: 1
 			path: test/functional/Resource/FileTest.php
 
-		-
-			message: "#^Strict comparison using \\=\\=\\= between string and true will always evaluate to false\\.$#"
-			count: 1
-			path: test/functional/Resource/FileTest.php
-
 		-
 			message: "#^Variable \\$cfg in isset\\(\\) is never defined\\.$#"
 			count: 1
 			path: test/functional/Resource/FileTest.php
 
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\GroupTest\\:\\:testGetAll\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/GroupTest.php
-
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\ShareLinksTest\\:\\:testShareLinks\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/ShareLinksTest.php
-
-		-
-			message: "#^Method Seafile\\\\Client\\\\Tests\\\\Functional\\\\Resource\\\\StarredFileTest\\:\\:testStarFile\\(\\) has no return type specified\\.$#"
-			count: 1
-			path: test/functional/Resource/StarredFileTest.php
-
 		-
 			message: "#^Call to an undefined method PHPUnit\\\\Framework\\\\MockObject\\\\MockObject\\|Seafile\\\\Client\\\\Http\\\\Client\\:\\:expects\\(\\)\\.$#"
 			count: 4
diff --git a/rector.php b/rector.php
index 5c04965..a4e4135 100644
--- a/rector.php
+++ b/rector.php
@@ -2,7 +2,6 @@
 
 declare(strict_types=1);
 
-use Rector\Carbon\Rector\FuncCall\DateFuncCallToCarbonRector;
 use Rector\CodingStyle\Rector\FuncCall\CountArrayToEmptyArrayComparisonRector;
 use Rector\CodingStyle\Rector\String_\SymplifyQuoteEscapeRector;
 use Rector\Config\RectorConfig;
@@ -42,7 +41,6 @@
 
     $rectorConfig->rules([
         CountArrayToEmptyArrayComparisonRector::class,
-        DateFuncCallToCarbonRector::class,
         LongArrayToShortArrayRector::class,
         RenameVariableToMatchMethodCallReturnTypeRector::class,
         SymplifyQuoteEscapeRector::class,
diff --git a/src/Type/Library.php b/src/Type/Library.php
index 9a37392..f72a093 100644
--- a/src/Type/Library.php
+++ b/src/Type/Library.php
@@ -18,30 +18,11 @@
  */
 class Library extends Type
 {
-    /**
-     * @var string
-     */
-    public $permission = '';
-
-    /**
-     * @var string
-     */
-    public $encrypted = '';
-
-    /**
-     * @var string
-     */
-    public $mtimeRelative = '';
-
-    /**
-     * @var DateTime
-     */
-    public $mtime;
-
-    /**
-     * @var string
-     */
-    public $owner = '';
+    public string $permission = '';
+    public string $encrypted = '';
+    public string $mtimeRelative = '';
+    public DateTime $mtime;
+    public string $owner = '';
 
     /**
      * @var string
diff --git a/test/functional/FunctionalTestCase.php b/test/functional/FunctionalTestCase.php
index 05a423d..6ab97ef 100644
--- a/test/functional/FunctionalTestCase.php
+++ b/test/functional/FunctionalTestCase.php
@@ -29,17 +29,10 @@
  */
 class FunctionalTestCase extends TestCase
 {
-    /** @var Client|null */
-    protected $client;
-
-    /** @var Logger|null */
-    protected $logger;
-
-    /** @var LibraryType|null */
-    protected $testLib;
-
-    /** @var Generator|null|Internet|Lorem|Person */
-    protected $faker;
+    protected ?Client $client;
+    protected ?Logger $logger;
+    protected ?LibraryType $testLib;
+    protected Internet|Lorem|null|Generator|Person $faker;
 
     /**
      * Skip functional tests when they do not have been set up correctly. Please refer to README.md on how to set them up.
@@ -132,7 +125,7 @@ protected function getTestLibraryType(): LibraryType
             $library = new Library($this->client);
             $this->testLib = $library->getById($libId);
 
-            if ($this->testLib->encrypted === true && array_key_exists('TEST_LIB_ENCRYPTED_PASSWORD', $_ENV)) {
+            if ($this->testLib->encrypted && array_key_exists('TEST_LIB_ENCRYPTED_PASSWORD', $_ENV)) {
                 self::assertTrue($library->decrypt(
                     $libId,
                     [
diff --git a/test/functional/Resource/FileTest.php b/test/functional/Resource/FileTest.php
index 229ba2f..eb1155b 100644
--- a/test/functional/Resource/FileTest.php
+++ b/test/functional/Resource/FileTest.php
@@ -2,12 +2,10 @@
 
 namespace Seafile\Client\Tests\Functional\Resource;
 
-use Carbon\Carbon;
 use Exception;
 use GuzzleHttp\Exception\GuzzleException;
 use Seafile\Client\Resource\Directory;
 use Seafile\Client\Resource\File;
-use Seafile\Client\Resource\Library;
 use Seafile\Client\Tests\Functional\FunctionalTestCase;
 use Seafile\Client\Type\DirectoryItem;
 
@@ -78,7 +76,7 @@ public function testHistory(): void
         $newFilename = tempnam($GLOBALS['BUILD_TMP'], 'Seafile-PHP-SDK_Test_File_History_Upload_');
         rename($newFilename, $newFilename . '.txt');
         $newFilename .= '.txt';
-        file_put_contents($newFilename, 'Hello World: ' . Carbon::now()->format('Y-m-d H:i:s'));
+        file_put_contents($newFilename, 'Hello World: ' . (new \DateTime)->format('Y-m-d H:i:s'));
 
         $this->logger->debug("#################### Uploading file " . $newFilename);
 
@@ -162,7 +160,7 @@ public function testRename(): void
         $libId = $_ENV['TEST_LIB_ENCRYPTED_ID'];
         $library = $this->getTestLibraryType();
 
-        if ($library->encrypted === true && isset($cfg->testLibPassword)) {
+        if ($library->encrypted && isset($cfg->testLibPassword)) {
             $success = $this->library->decrypt($libId, ['query' => ['password' => $_ENV['TEST_LIB_ENCRYPTED_PASSWORD']]]);
             self::assertTrue($success);
         }
@@ -176,7 +174,7 @@ public function testRename(): void
         $success = $this->file->create($library, $dirItem);
         self::assertTrue($success);
 
-        $newFilename = 'test_' . Carbon::now()->format('U') . '.txt';
+        $newFilename = 'test_' . (new \DateTime)->format('U') . '.txt';
         $dirItem = $this->file->getFileDetail($library, $path . $fileName);
 
         $this->logger->debug("#################### File to be renamed: " . $path . $dirItem->name);
@@ -185,7 +183,7 @@ public function testRename(): void
         self::assertTrue($success);
         $this->logger->debug("#################### File renamed from " . $path . $fileName . ' to ' . $newFilename);
 
-        $newFilename = 'even_newer_file_name_test_' . Carbon::now()->format('U') . '.txt';
+        $newFilename = 'even_newer_file_name_test_' . (new \DateTime)->format('U') . '.txt';
         $success = $this->file->rename($library, $dirItem, $newFilename);
 
         self::assertTrue($success);
diff --git a/test/functional/Resource/ShareLinksTest.php b/test/functional/Resource/ShareLinksTest.php
index 6a68a9a..ed410c0 100644
--- a/test/functional/Resource/ShareLinksTest.php
+++ b/test/functional/Resource/ShareLinksTest.php
@@ -2,7 +2,6 @@
 
 namespace Seafile\Client\Tests\Functional\Resource;
 
-use Carbon\Carbon;
 use Exception;
 use Seafile\Client\Resource\File;
 use Seafile\Client\Resource\Library;
@@ -43,6 +42,7 @@ protected function setUp(): void
      * and successfully so that's postponed for now.
      *
      * @throws Exception
+     * @throws \GuzzleHttp\Exception\GuzzleException
      */
     public function testShareLinks(): void
     {
@@ -68,7 +68,7 @@ public function testShareLinks(): void
         $newFilename = $GLOBALS['BUILD_TMP'] . '/Seafile-PHP-SDK_Test_Upload.txt';
 
         if (!file_exists($newFilename)) {
-            file_put_contents($newFilename, 'Hello World: ' . Carbon::now()->format('Y-m-d H:i:s'));
+            file_put_contents($newFilename, 'Hello World: ' . (new \DateTime)->format('Y-m-d H:i:s'));
         }
 
         $this->logger->debug("#################### Uploading file " . $newFilename);
diff --git a/test/unit/Resource/StarredFileTest.php b/test/unit/Resource/StarredFileTest.php
index ebda192..b15ad49 100644
--- a/test/unit/Resource/StarredFileTest.php
+++ b/test/unit/Resource/StarredFileTest.php
@@ -105,8 +105,7 @@ public function testStar(): void
             )
             // Return what was passed to offsetGet as a new instance
             ->will(self::returnCallback(
-                function ($method, $uri, array $params) use ($starResponse, $library, $directoryItem): Response|\Response {
-
+                function ($method, $uri, array $params) use ($starResponse, $library, $directoryItem): Response {
                     $hasParams = array_key_exists('headers', $params)
                         && array_key_exists('multipart', $params)
                         && array_key_exists('name', $params['multipart'][0])
diff --git a/test/unit/UnitTestCase.php b/test/unit/UnitTestCase.php
index 6e4cacb..8317972 100644
--- a/test/unit/UnitTestCase.php
+++ b/test/unit/UnitTestCase.php
@@ -25,16 +25,15 @@ class UnitTestCase extends TestCase
      *
      * @param object $object Instantiated object that we will run method on.
      * @param string $methodName Method name to call
-     * @param array $parameters Array of parameters to pass into method.
+     * @param array<int, int|\Seafile\Client\Type\Library>|array<int, string> $parameters Params to pass to method.
      *
      * @return mixed Method return.
      * @throws ReflectionException
      */
-    public function invokeMethod(&$object, string $methodName, array $parameters = [])
+    public function invokeMethod(object &$object, string $methodName, array $parameters = []): mixed
     {
         $reflectionClass = new ReflectionClass($object::class);
         $reflectionMethod = $reflectionClass->getMethod($methodName);
-        $reflectionMethod->setAccessible(true);
 
         return $reflectionMethod->invokeArgs($object, $parameters);
     }