diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0999cb3..9e0b5bd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ on:
             - 'master'
 
 env:
-    CONSISTENCE_PHP_VERSION: '7.3'
+    CONSISTENCE_PHP_VERSION: '8.0'
 
 jobs:
     composer-validate:
@@ -45,9 +45,9 @@ jobs:
             fail-fast: false
             matrix:
                 php-version:
-                    - '7.2'
-                    - '7.3'
-                    - '7.4'
+                    - '8.0'
+                    - '8.1'
+                    - '8.2'
 
         steps:
             -
@@ -108,9 +108,9 @@ jobs:
             fail-fast: false
             matrix:
                 php-version:
-                    - '7.2'
-                    - '7.3'
-                    - '7.4'
+                    - '8.0'
+                    - '8.1'
+                    - '8.2'
                 composer-dependencies:
                     - 'highest'
                     - 'lowest'
diff --git a/Consistence/Sniffs/Exceptions/ExceptionDeclarationSniff.php b/Consistence/Sniffs/Exceptions/ExceptionDeclarationSniff.php
index befffd6..9e1079f 100644
--- a/Consistence/Sniffs/Exceptions/ExceptionDeclarationSniff.php
+++ b/Consistence/Sniffs/Exceptions/ExceptionDeclarationSniff.php
@@ -17,8 +17,7 @@ class ExceptionDeclarationSniff implements \PHP_CodeSniffer\Sniffs\Sniff
 	public const CODE_NOT_CHAINABLE = 'NotChainable';
 	public const CODE_INCORRECT_EXCEPTION_DIRECTORY = 'IncorrectExceptionDirectory';
 
-	/** @var string */
-	public $exceptionsDirectoryName = 'exceptions';
+	public string $exceptionsDirectoryName = 'exceptions';
 
 	/**
 	 * @return int[]
diff --git a/Consistence/Sniffs/NamingConventions/ValidVariableNameSniff.php b/Consistence/Sniffs/NamingConventions/ValidVariableNameSniff.php
index 6fd7863..b61ca8c 100644
--- a/Consistence/Sniffs/NamingConventions/ValidVariableNameSniff.php
+++ b/Consistence/Sniffs/NamingConventions/ValidVariableNameSniff.php
@@ -13,7 +13,7 @@ class ValidVariableNameSniff extends \PHP_CodeSniffer\Sniffs\AbstractVariableSni
 	public const CODE_CAMEL_CAPS = 'NotCamelCaps';
 
 	/** @var string[] */
-	private static $phpReservedVariables = [
+	private static array $phpReservedVariables = [
 		'_SERVER',
 		'_GET',
 		'_POST',
diff --git a/composer.json b/composer.json
index f2a6cfd..4f275a1 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,8 @@
 		}
 	],
 	"require": {
-		"php": "~7.2",
-		"squizlabs/php_codesniffer": "~3.5.5",
+		"php": "~8.0",
+		"squizlabs/php_codesniffer": "~3.7",
 		"slevomat/coding-standard": "~6.0"
 	},
 	"require-dev": {
diff --git a/tests/Sniffs/Exceptions/ExceptionDeclarationSniffTest.php b/tests/Sniffs/Exceptions/ExceptionDeclarationSniffTest.php
index fbfb2ce..be41f88 100644
--- a/tests/Sniffs/Exceptions/ExceptionDeclarationSniffTest.php
+++ b/tests/Sniffs/Exceptions/ExceptionDeclarationSniffTest.php
@@ -205,7 +205,7 @@ public function testExceptionIsPlacedInCorrectDirectory(): void
 	public function testExceptionIsPlacedInCorrectDirectoryOnWindows(): void
 	{
 		// PHP_CodeSniffer detects the path with backslashes on Windows
-		$resultFile = $this->checkFile(__DIR__ . '\data\ValidNameException.php', [
+		$resultFile = $this->checkFile(__DIR__ . '/data/ValidNameException.php', [
 			'exceptionsDirectoryName' => 'data',
 		]);