diff --git a/src/TokensList.php b/src/TokensList.php
index dd90bb991..ea41d2b86 100644
--- a/src/TokensList.php
+++ b/src/TokensList.php
@@ -21,17 +21,13 @@ class TokensList implements ArrayAccess
 {
     /**
      * The count of tokens.
-     *
-     * @var int
      */
-    public $count = 0;
+    public int $count = 0;
 
     /**
      * The index of the next token to be returned.
-     *
-     * @var int
      */
-    public $idx = 0;
+    public int $idx = 0;
 
     /** @param Token[] $tokens The array of tokens. */
     public function __construct(public array $tokens = [])
diff --git a/src/UtfString.php b/src/UtfString.php
index 843416223..1c23d5722 100644
--- a/src/UtfString.php
+++ b/src/UtfString.php
@@ -33,43 +33,33 @@ class UtfString implements ArrayAccess, Stringable
 {
     /**
      * The raw, multi-byte string.
-     *
-     * @var string
      */
-    public $str = '';
+    public string $str = '';
 
     /**
      * The index of current byte.
      *
      * For ASCII strings, the byte index is equal to the character index.
-     *
-     * @var int
      */
-    public $byteIdx = 0;
+    public int $byteIdx = 0;
 
     /**
      * The index of current character.
      *
      * For non-ASCII strings, some characters occupy more than one byte and
      * the character index will have a lower value than the byte index.
-     *
-     * @var int
      */
-    public $charIdx = 0;
+    public int $charIdx = 0;
 
     /**
      * The length of the string (in bytes).
-     *
-     * @var int
      */
-    public $byteLen = 0;
+    public int $byteLen = 0;
 
     /**
      * The length of the string (in characters).
-     *
-     * @var int
      */
-    public $charLen = 0;
+    public int $charLen = 0;
 
     /** @param string $str the string */
     public function __construct(string $str)
diff --git a/tests/Lexer/TokensListTest.php b/tests/Lexer/TokensListTest.php
index 0fa6627a0..8df560c41 100644
--- a/tests/Lexer/TokensListTest.php
+++ b/tests/Lexer/TokensListTest.php
@@ -18,7 +18,7 @@ class TokensListTest extends TestCase
      *
      * @var Token[]
      */
-    public $tokens;
+    public array $tokens;
 
     /**
      * Test setup.
diff --git a/tests/benchmarks/UtfStringBench.php b/tests/benchmarks/UtfStringBench.php
index f1b8b6ef2..f5af47647 100644
--- a/tests/benchmarks/UtfStringBench.php
+++ b/tests/benchmarks/UtfStringBench.php
@@ -10,8 +10,7 @@
 
 class UtfStringBench
 {
-    /** @var string */
-    private $testContents;
+    private string $testContents;
 
     /**
      * @BeforeMethods("setUp")