diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f1df917..6abc0f1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,24 +10,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - operating-system: 'ubuntu-latest'
-            php-version: '7.3'
-            job-description: 'Ubuntu; PHP 7.3; latest-deps'
-
-          - operating-system: 'ubuntu-latest'
-            php-version: '7.3'
-            composer-flags: '--prefer-lowest'
-            job-description: 'Ubuntu; PHP 7.3; lowest-deps'
-
-          - operating-system: 'ubuntu-latest'
-            php-version: '7.4'
-            job-description: 'Ubuntu; PHP 7.4; latest-deps'
-
-          - operating-system: 'ubuntu-latest'
-            php-version: '7.4'
-            composer-flags: '--prefer-lowest'
-            job-description: 'Ubuntu; PHP 7.4; lowest-deps'
-
           - operating-system: 'ubuntu-latest'
             php-version: '8.0'
             job-description: 'Ubuntu; PHP 8.0; latest-deps'
diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 0b23676..c5b8192 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -7,7 +7,7 @@
 return (new PhpCsFixer\Config())
     ->setRules([
         '@Symfony' => true,
-        '@PHP73Migration' => true,
+        '@PHP80Migration' => true,
 
         'combine_consecutive_issets' => true,
         'combine_consecutive_unsets' => true,
diff --git a/composer.json b/composer.json
index f0f98eb..abd61da 100644
--- a/composer.json
+++ b/composer.json
@@ -10,12 +10,12 @@
         }
     ],
     "require": {
-        "php": ">=7.3",
-        "symfony/config": "^4.4||^5.0||^6.0",
-        "symfony/yaml": "^4.4||^5.0||^6.0"
+        "php": ">=8.0.2",
+        "symfony/config": "^5.4||^6.0",
+        "symfony/yaml": "^5.4||^6.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^9.5.16",
         "friendsofphp/php-cs-fixer": "^3.0"
     },
     "autoload": {
diff --git a/src/Config.php b/src/Config.php
index 1c5461e..971b1ce 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -7,7 +7,7 @@
 
 class Config
 {
-    private $parameters;
+    private array $parameters;
 
     private function __construct(array $data)
     {
@@ -17,10 +17,7 @@ private function __construct(array $data)
         );
     }
 
-    /**
-     * @return static
-     */
-    public static function createFromYaml(string $configPath): self
+    public static function createFromYaml(string $configPath): static
     {
         return new static(Yaml::parseFile($configPath));
     }
diff --git a/src/Exception/ParserException.php b/src/Exception/ParserException.php
index cff530e..2dea7bc 100644
--- a/src/Exception/ParserException.php
+++ b/src/Exception/ParserException.php
@@ -4,8 +4,8 @@
 
 class ParserException extends \Exception
 {
-    private $errorLogLine;
-    private $pattern;
+    private ?string $errorLogLine = null;
+    private ?string $pattern = null;
 
     public function getErrorLogLine(): ?string
     {
diff --git a/src/Iterator.php b/src/Iterator.php
index a71e24c..f886250 100644
--- a/src/Iterator.php
+++ b/src/Iterator.php
@@ -6,38 +6,22 @@
 
 class Iterator implements \Iterator
 {
-    /**
-     * @var Parser
-     */
-    private $parser;
+    private Parser $parser;
 
-    /**
-     * @var string
-     */
-    private $logFile;
+    private string $logFile;
 
     /**
      * @var resource
      */
     private $fileHandler;
 
-    /**
-     * @var string|null
-     */
-    private $currentLine;
+    private ?string $currentLine = null;
 
-    /**
-     * @var bool
-     */
-    private $skipEmptyLines;
-    /**
-     * @var int
-     */
-    private $seek;
-    /**
-     * @var string
-     */
-    private $name;
+    private bool $skipEmptyLines;
+
+    private ?int $seek = null;
+
+    private string $name = '';
 
     public function __construct(string $logFile, Parser $parser, bool $skipEmptyLines = true)
     {
@@ -46,9 +30,6 @@ public function __construct(string $logFile, Parser $parser, bool $skipEmptyLine
         $this->skipEmptyLines = $skipEmptyLines;
     }
 
-    /**
-     * Destructor.
-     */
     public function __destruct()
     {
         @\fclose($this->fileHandler);
diff --git a/src/Logio.php b/src/Logio.php
index 8c19ef8..cd8c39d 100644
--- a/src/Logio.php
+++ b/src/Logio.php
@@ -7,7 +7,7 @@ class Logio
     /**
      * @var Parser[]
      */
-    private $parsers = [];
+    private array $parsers = [];
 
     public function __construct(Config $config)
     {
diff --git a/src/Parser.php b/src/Parser.php
index 46ba730..2fda794 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -6,8 +6,8 @@
 
 class Parser
 {
-    protected $name;
-    protected $parameters;
+    protected string $name;
+    protected array $parameters;
 
     public function __construct(string $name, array $parameters)
     {
diff --git a/tests/ConfigTest.php b/tests/ConfigTest.php
index 6fde190..82f6673 100644
--- a/tests/ConfigTest.php
+++ b/tests/ConfigTest.php
@@ -8,7 +8,7 @@
 
 class ConfigTest extends TestCase
 {
-    private $fixturesDir = __DIR__.'/fixtures';
+    private string $fixturesDir = __DIR__.'/fixtures';
 
     public function testConfigSuccess(): void
     {
diff --git a/tests/LogioTest.php b/tests/LogioTest.php
index f0814d9..08c671b 100644
--- a/tests/LogioTest.php
+++ b/tests/LogioTest.php
@@ -10,11 +10,8 @@
 
 class LogioTest extends TestCase
 {
-    private $fixturesDir = __DIR__.'/fixtures';
-    /**
-     * @var Config
-     */
-    private $config;
+    private string $fixturesDir = __DIR__.'/fixtures';
+    private Config $config;
 
     protected function setUp(): void
     {
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index 1c46220..6425d72 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -8,11 +8,8 @@
 
 class ParserTest extends TestCase
 {
-    private $fixturesDir = __DIR__.'/fixtures';
-    /**
-     * @var Config
-     */
-    private $config;
+    private string $fixturesDir = __DIR__.'/fixtures';
+    private Config $config;
 
     protected function setUp(): void
     {