diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index 41b615f..17e894e 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -26,4 +26,4 @@ jobs:
     name: "PHPUnit"
     uses: "doctrine/.github/.github/workflows/continuous-integration.yml@3.0.0"
     with:
-      php-versions: '["7.1", "7.2", "7.3", "7.4", "8.0", "8.1", "8.2"]'
+      php-versions: '["8.1", "8.2"]'
diff --git a/UPGRADE.md b/UPGRADE.md
index 79d5bc8..1933fcb 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -9,6 +9,10 @@ awareness about deprecated code.
 # Upgrade to 3.0.0
 
 `Doctrine\Common\Lexer\Token` no longer implements `ArrayAccess`.
+Parameter type declarations have been added to
+`Doctrine\Common\Lexer\AbstractLexer` and `Doctrine\Common\Lexer\Token`.
+You should add both parameter type declarations and return type declarations to
+your lexers, based on the `@return` phpdoc.
 
 # Upgrade to 2.0.0
 
diff --git a/composer.json b/composer.json
index 78bf961..8a61afe 100644
--- a/composer.json
+++ b/composer.json
@@ -26,14 +26,14 @@
     ],
     "homepage": "https://www.doctrine-project.org/projects/lexer.html",
     "require": {
-        "php": "^7.1 || ^8.0"
+        "php": "^8.1"
     },
     "require-dev": {
-        "doctrine/coding-standard": "^9 || ^10",
-        "phpstan/phpstan": "^1.3",
-        "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+        "doctrine/coding-standard": "^10",
+        "phpstan/phpstan": "^1.9",
+        "phpunit/phpunit": "^9.5",
         "psalm/plugin-phpunit": "^0.18.3",
-        "vimeo/psalm": "^4.11 || ^5.0"
+        "vimeo/psalm": "^5.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index 54a9e54..b7b6083 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -6,7 +6,7 @@
     <arg name="cache" value=".phpcs-cache"/>
     <arg name="colors" />
 
-    <config name="php_version" value="70100"/>
+    <config name="php_version" value="80100"/>
 
     <!-- Ignore warnings and show progress of the run -->
     <arg value="np"/>
@@ -15,21 +15,10 @@
     <file>tests</file>
 
     <rule ref="Doctrine">
-        <!-- Traversable type hints often end up as mixed[], so we skip them for now -->
-        <exclude name="SlevomatCodingStandard.TypeHints.PropertyTypeHint.MissingTraversableTypeHintSpecification" />
-        <exclude name="SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingTraversableTypeHintSpecification" />
-        <exclude name="SlevomatCodingStandard.TypeHints.ReturnTypeHint.MissingTraversableTypeHintSpecification" />
-
         <!-- Will cause BC breaks to method signatures - disabled for now -->
-        <exclude name="SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint" />
         <exclude name="SlevomatCodingStandard.TypeHints.ReturnTypeHint.MissingNativeTypeHint" />
 
         <!-- Disabled to avoid class renaming - to be handled in a separate PR -->
         <exclude name="SlevomatCodingStandard.Classes.SuperfluousAbstractClassNaming" />
     </rule>
-
-    <rule ref="SlevomatCodingStandard.Commenting.RequireOneLineDocComment.MultiLineDocComment">
-        <!-- Remove when dropping PHPUnit 7 -->
-        <exclude-pattern>tests/*</exclude-pattern>
-    </rule>
 </ruleset>
diff --git a/psalm.xml b/psalm.xml
index dfb8bc6..fa14053 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -37,6 +37,7 @@
         </MixedAssignment>
         <MixedReturnStatement>
             <errorLevel type="suppress">
+                <file name="src/AbstractLexer.php" />
                 <file name="src/Token.php" />
             </errorLevel>
         </MixedReturnStatement>
@@ -44,6 +45,7 @@
             <errorLevel type="suppress">
                 <!-- https://github.com/vimeo/psalm/issues/8891 -->
                 <file name="src/AbstractLexer.php" />
+                <file name="tests/EnumLexer.php" />
             </errorLevel>
         </ReferenceConstraintViolation>
         <RedundantConditionGivenDocblockType>
diff --git a/src/AbstractLexer.php b/src/AbstractLexer.php
index eed4c51..7c31935 100644
--- a/src/AbstractLexer.php
+++ b/src/AbstractLexer.php
@@ -7,7 +7,6 @@
 use ReflectionClass;
 use UnitEnum;
 
-use function get_class;
 use function implode;
 use function preg_split;
 use function sprintf;
@@ -27,31 +26,25 @@ abstract class AbstractLexer
 {
     /**
      * Lexer original input string.
-     *
-     * @var string
      */
-    private $input;
+    private string $input;
 
     /**
      * Array of scanned tokens.
      *
      * @var list<Token<T, V>>
      */
-    private $tokens = [];
+    private array $tokens = [];
 
     /**
      * Current lexer position in input string.
-     *
-     * @var int
      */
-    private $position = 0;
+    private int $position = 0;
 
     /**
      * Current peek of current lexer position.
-     *
-     * @var int
      */
-    private $peek = 0;
+    private int $peek = 0;
 
     /**
      * The next token in the input.
@@ -59,7 +52,7 @@ abstract class AbstractLexer
      * @var mixed[]|null
      * @psalm-var Token<T, V>|null
      */
-    public $lookahead;
+    public Token|null $lookahead;
 
     /**
      * The last matched/seen token.
@@ -67,14 +60,12 @@ abstract class AbstractLexer
      * @var mixed[]|null
      * @psalm-var Token<T, V>|null
      */
-    public $token;
+    public Token|null $token;
 
     /**
      * Composed regex for input parsing.
-     *
-     * @var string|null
      */
-    private $regex;
+    private string|null $regex = null;
 
     /**
      * Sets the input data to be tokenized.
@@ -86,7 +77,7 @@ abstract class AbstractLexer
      *
      * @return void
      */
-    public function setInput($input)
+    public function setInput(string $input)
     {
         $this->input  = $input;
         $this->tokens = [];
@@ -125,7 +116,7 @@ public function resetPeek()
      *
      * @return void
      */
-    public function resetPosition($position = 0)
+    public function resetPosition(int $position = 0)
     {
         $this->position = $position;
     }
@@ -133,11 +124,9 @@ public function resetPosition($position = 0)
     /**
      * Retrieve the original lexer's input until a given position.
      *
-     * @param int $position
-     *
      * @return string
      */
-    public function getInputUntilPosition($position)
+    public function getInputUntilPosition(int $position)
     {
         return substr($this->input, 0, $position);
     }
@@ -151,7 +140,7 @@ public function getInputUntilPosition($position)
      *
      * @psalm-assert-if-true !=null $this->lookahead
      */
-    public function isNextToken($type)
+    public function isNextToken(int|string|UnitEnum $type)
     {
         return $this->lookahead !== null && $this->lookahead->isA($type);
     }
@@ -194,7 +183,7 @@ public function moveNext()
      *
      * @return void
      */
-    public function skipUntil($type)
+    public function skipUntil(int|string|UnitEnum $type)
     {
         while ($this->lookahead !== null && ! $this->lookahead->isA($type)) {
             $this->moveNext();
@@ -204,12 +193,9 @@ public function skipUntil($type)
     /**
      * Checks if given value is identical to the given token.
      *
-     * @param string     $value
-     * @param int|string $token
-     *
      * @return bool
      */
-    public function isA($value, $token)
+    public function isA(string $value, int|string|UnitEnum $token)
     {
         return $this->getType($value) === $token;
     }
@@ -250,14 +236,14 @@ public function glimpse()
      *
      * @return void
      */
-    protected function scan($input)
+    protected function scan(string $input)
     {
         if (! isset($this->regex)) {
             $this->regex = sprintf(
                 '/(%s)|%s/%s',
                 implode(')|(', $this->getCatchablePatterns()),
                 implode('|', $this->getNonCatchablePatterns()),
-                $this->getModifiers()
+                $this->getModifiers(),
             );
         }
 
@@ -277,7 +263,7 @@ protected function scan($input)
             $this->tokens[] = new Token(
                 $firstMatch,
                 $type,
-                $match[1]
+                $match[1],
             );
         }
     }
@@ -289,10 +275,10 @@ protected function scan($input)
      *
      * @return int|string
      */
-    public function getLiteral($token)
+    public function getLiteral(int|string|UnitEnum $token)
     {
         if ($token instanceof UnitEnum) {
-            return get_class($token) . '::' . $token->name;
+            return $token::class . '::' . $token->name;
         }
 
         $className = static::class;
@@ -336,11 +322,9 @@ abstract protected function getNonCatchablePatterns();
     /**
      * Retrieve token type. Also processes the token value if necessary.
      *
-     * @param string $value
-     *
      * @return T|null
      *
      * @param-out V $value
      */
-    abstract protected function getType(&$value);
+    abstract protected function getType(string &$value);
 }
diff --git a/src/Token.php b/src/Token.php
index 68a9fa8..b6df694 100644
--- a/src/Token.php
+++ b/src/Token.php
@@ -20,7 +20,7 @@ final class Token
      * @readonly
      * @var V
      */
-    public $value;
+    public string|int $value;
 
     /**
      * The type of the token (identifier, numeric, string, input parameter, none)
@@ -34,15 +34,14 @@ final class Token
      * The position of the token in the input string
      *
      * @readonly
-     * @var int
      */
-    public $position;
+    public int $position;
 
     /**
      * @param V      $value
      * @param T|null $type
      */
-    public function __construct($value, $type, int $position)
+    public function __construct(string|int $value, $type, int $position)
     {
         $this->value    = $value;
         $this->type     = $type;
diff --git a/tests/AbstractLexerTest.php b/tests/AbstractLexerTest.php
index 7050914..4a74a9d 100644
--- a/tests/AbstractLexerTest.php
+++ b/tests/AbstractLexerTest.php
@@ -16,8 +16,7 @@
 
 class AbstractLexerTest extends TestCase
 {
-    /** @var ConcreteLexer */
-    private $concreteLexer;
+    private ConcreteLexer $concreteLexer;
 
     public function setUp(): void
     {
@@ -29,9 +28,7 @@ public function tearDown(): void
         setlocale(LC_ALL, null);
     }
 
-    /**
-     * @psalm-return list<array{string, list<Token<string, string|int>>}>
-     */
+    /** @psalm-return list<array{string, list<Token<string, string|int>>}> */
     public function dataProvider(): array
     {
         return [
@@ -113,7 +110,7 @@ public function testSkipUntil(): void
 
         $this->assertEquals(
             new Token('=', 'operator', 5),
-            $this->concreteLexer->lookahead
+            $this->concreteLexer->lookahead,
         );
     }
 
@@ -125,7 +122,7 @@ public function testUtf8Mismatch(): void
 
         $this->assertEquals(
             new Token("\xE9=10", 'string', 0),
-            $this->concreteLexer->lookahead
+            $this->concreteLexer->lookahead,
         );
     }
 
@@ -172,9 +169,7 @@ public function testGlimpse(string $input, array $expectedTokens): void
         $this->assertNull($this->concreteLexer->peek());
     }
 
-    /**
-     * @psalm-return list<array{string, int, string}>
-     */
+    /** @psalm-return list<array{string, int, string}> */
     public function inputUntilPositionDataProvider(): array
     {
         return [
@@ -182,13 +177,11 @@ public function inputUntilPositionDataProvider(): array
         ];
     }
 
-    /**
-     * @dataProvider inputUntilPositionDataProvider
-     */
+    /** @dataProvider inputUntilPositionDataProvider */
     public function testGetInputUntilPosition(
         string $input,
         int $position,
-        string $expectedInput
+        string $expectedInput,
     ): void {
         $this->concreteLexer->setInput($input);
 
@@ -242,15 +235,12 @@ public function testGetLiteral(): void
         $this->assertSame('fake_token', $this->concreteLexer->getLiteral('fake_token'));
     }
 
-    /**
-     * @requires PHP 8.1
-     */
     public function testGetLiteralWithEnumLexer(): void
     {
         $enumLexer = new EnumLexer();
         $this->assertSame(
             'Doctrine\Tests\Common\Lexer\TokenType::OPERATOR',
-            $enumLexer->getLiteral(TokenType::OPERATOR)
+            $enumLexer->getLiteral(TokenType::OPERATOR),
         );
     }
 
diff --git a/tests/ConcreteLexer.php b/tests/ConcreteLexer.php
index 62fc2db..989bae3 100644
--- a/tests/ConcreteLexer.php
+++ b/tests/ConcreteLexer.php
@@ -12,7 +12,7 @@
 /** @extends AbstractLexer<string, string|int> */
 class ConcreteLexer extends AbstractLexer
 {
-    public const INT = 'int';
+    final public const INT = 'int';
 
     /**
      * {@inheritDoc}
@@ -37,10 +37,7 @@ protected function getNonCatchablePatterns(): array
         ];
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    protected function getType(&$value): string
+    protected function getType(string|int|float &$value): string
     {
         if (is_numeric($value)) {
             $value = (int) $value;
diff --git a/tests/EnumLexer.php b/tests/EnumLexer.php
index 083d0a2..1aebbe1 100644
--- a/tests/EnumLexer.php
+++ b/tests/EnumLexer.php
@@ -35,10 +35,7 @@ protected function getNonCatchablePatterns(): array
         ];
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    protected function getType(&$value): TokenType
+    protected function getType(string &$value): TokenType
     {
         if (is_numeric($value)) {
             $value = (int) $value;
diff --git a/tests/MutableLexer.php b/tests/MutableLexer.php
index 5530b29..b8b706d 100644
--- a/tests/MutableLexer.php
+++ b/tests/MutableLexer.php
@@ -10,7 +10,7 @@
 class MutableLexer extends AbstractLexer
 {
     /** @var string[] */
-    private $catchablePatterns = [];
+    private array $catchablePatterns = [];
 
     public function addCatchablePattern(string $pattern): void
     {
@@ -33,10 +33,7 @@ protected function getNonCatchablePatterns(): array
         return ['[\s,]+'];
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    protected function getType(&$value): int
+    protected function getType(string &$value): int
     {
         return 1;
     }