diff --git a/.github/workflows/php-checks.yml b/.github/workflows/php-checks.yml
index 08f9257..3fc04d2 100644
--- a/.github/workflows/php-checks.yml
+++ b/.github/workflows/php-checks.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['7.4', '8.0', '8.1', '8.2']
+        php-versions: ['8.1', '8.2', '8.3']
     name: PHP ${{ matrix.php-versions }} tests
     steps:
       - name: Checkout
diff --git a/.gitignore b/.gitignore
index 0794651..2cf6eb4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
-/vendor/
-composer.lock
-.phpunit.result.cache
+/composer.lock
+/vendor
+
+/.php-cs-fixer.cache
+/.phpunit.cache
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b3d20b..403c757 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## 3.0.0
+
+### PHP support
+
+- Dropped support for PHP `8.0` and lower.
+- Added support for PHP `8.3`.
+
+### 3rd party updates
+
+- Updated `symfony/finder` to version `6`.
+
 ## 2.0.1
 
 ### PHP support
diff --git a/composer.json b/composer.json
index 9b3dadd..a19ca26 100644
--- a/composer.json
+++ b/composer.json
@@ -40,13 +40,13 @@
   },
   "minimum-stability": "stable",
   "require": {
-    "php": "7.4.* || 8.0.* || 8.1.* || 8.2.*",
+    "php": "8.1.* || 8.2.* || 8.3.*",
     "ext-json": "*",
-    "symfony/finder": "^5.0.0"
+    "symfony/finder": "^6.0.0"
   },
   "require-dev": {
-    "phpstan/phpstan": "1.9.12",
-    "phpunit/phpunit": "9.5.28",
-    "squizlabs/php_codesniffer": "3.7.1"
+    "phpstan/phpstan": "1.10.46",
+    "phpunit/phpunit": "10.4.2",
+    "squizlabs/php_codesniffer": "3.7.2"
   }
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 238f65f..24076d8 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,15 +1,16 @@
+<?xml version="1.0"?>
 <phpunit
-        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-        xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/8.5/phpunit.xsd"
-        backupGlobals="false"
-        backupStaticAttributes="false"
-        bootstrap="vendor/autoload.php"
-        colors="true"
-         >
-
-    <testsuites>
-        <testsuite name="ProjectVersioner Test Suite">
-            <directory>./tests/</directory>
-        </testsuite>
-    </testsuites>
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.4/phpunit.xsd"
+  backupGlobals="false"
+  bootstrap="vendor/autoload.php"
+  colors="true"
+  cacheDirectory=".phpunit.cache"
+  backupStaticProperties="false"
+>
+  <testsuites>
+    <testsuite name="ProjectVersioner Test Suite">
+      <directory>./tests/</directory>
+    </testsuite>
+  </testsuites>
 </phpunit>
diff --git a/src/Naneau/ProjectVersioner/Reader/Composer.php b/src/Naneau/ProjectVersioner/Reader/Composer.php
index 41de516..d5b511d 100644
--- a/src/Naneau/ProjectVersioner/Reader/Composer.php
+++ b/src/Naneau/ProjectVersioner/Reader/Composer.php
@@ -6,7 +6,7 @@
 /**
  * Composer
  *
- * Finds version from composer lock file
+ * Finds the version from composer lock file
  */
 class Composer implements ReaderInterface
 {
@@ -21,7 +21,7 @@ public function canRead(string $directory): bool
     /**
      * {@inheritdoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): int|string|null
     {
         $contents = file_get_contents($directory . '/composer.lock');
         if (!$contents) {
diff --git a/src/Naneau/ProjectVersioner/Reader/ComposerJson.php b/src/Naneau/ProjectVersioner/Reader/ComposerJson.php
index e7b813d..f6a0758 100644
--- a/src/Naneau/ProjectVersioner/Reader/ComposerJson.php
+++ b/src/Naneau/ProjectVersioner/Reader/ComposerJson.php
@@ -1,6 +1,7 @@
 <?php
 namespace Naneau\ProjectVersioner\Reader;
 
+use JsonException;
 use Naneau\ProjectVersioner\ReaderInterface;
 
 use stdClass;
@@ -21,14 +22,19 @@ public function canRead(string $directory): bool
     /**
      * {@inheritdoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): int|string|null
     {
         $json = @file_get_contents($directory . '/composer.json');
         if (!$json) {
             return null;
         }
 
-        $json = json_decode($json, false);
+        try {
+            $json = json_decode($json, false, 512, JSON_THROW_ON_ERROR);
+        } catch (JsonException) {
+            return null;
+        }
+
         if (!($json instanceof stdClass) || empty($json->version)) {
             return null;
         }
diff --git a/src/Naneau/ProjectVersioner/Reader/ComposerPackage.php b/src/Naneau/ProjectVersioner/Reader/ComposerPackage.php
index c4bccc9..d1331a9 100644
--- a/src/Naneau/ProjectVersioner/Reader/ComposerPackage.php
+++ b/src/Naneau/ProjectVersioner/Reader/ComposerPackage.php
@@ -1,6 +1,7 @@
 <?php
 namespace Naneau\ProjectVersioner\Reader;
 
+use JsonException;
 use Naneau\ProjectVersioner\ReaderInterface;
 
 use stdClass;
@@ -15,10 +16,8 @@ class ComposerPackage implements ReaderInterface
 {
     /**
      * The page name to look for
-     *
-     * @var string
      */
-    private $package;
+    private string $package;
 
     public function __construct(string $package)
     {
@@ -46,7 +45,7 @@ public function canRead(string $directory): bool
     /**
      * {@inheritdoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): int|string|null
     {
         $package = $this->getPackageFromLockFile($directory);
 
@@ -88,7 +87,12 @@ private function getPackageFromLockFile(string $directory): ?stdClass
             return null;
         }
 
-        $parsed = json_decode($contents, false);
+        try {
+            $parsed = json_decode($contents, false, 512, JSON_THROW_ON_ERROR);
+        } catch (JsonException) {
+            return null;
+        }
+
         if (!isset($parsed->packages)) {
             return null;
         }
diff --git a/src/Naneau/ProjectVersioner/Reader/File.php b/src/Naneau/ProjectVersioner/Reader/File.php
index 3a78a23..fa1a3bd 100644
--- a/src/Naneau/ProjectVersioner/Reader/File.php
+++ b/src/Naneau/ProjectVersioner/Reader/File.php
@@ -33,7 +33,7 @@ public function canRead(string $directory): bool
     /**
      * {@inheritdoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): int|string|null
     {
         $contents = file_get_contents($directory . DIRECTORY_SEPARATOR . $this->getFile());
         if (!$contents) {
diff --git a/src/Naneau/ProjectVersioner/Reader/Finder/Contents.php b/src/Naneau/ProjectVersioner/Reader/Finder/Contents.php
index 81ad013..11a955f 100644
--- a/src/Naneau/ProjectVersioner/Reader/Finder/Contents.php
+++ b/src/Naneau/ProjectVersioner/Reader/Finder/Contents.php
@@ -11,7 +11,7 @@ class Contents extends Finder
     /**
      * {@inheritdoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): string
     {
         $hash = '';
         foreach ($this->getFinder() as $file) {
diff --git a/src/Naneau/ProjectVersioner/Reader/Finder/Finder.php b/src/Naneau/ProjectVersioner/Reader/Finder/Finder.php
index 42f9480..c558a06 100644
--- a/src/Naneau/ProjectVersioner/Reader/Finder/Finder.php
+++ b/src/Naneau/ProjectVersioner/Reader/Finder/Finder.php
@@ -8,16 +8,14 @@
 /**
  * Finder
  *
- * Base class for finder based readers
+ * Base class for finder-based readers
  */
 abstract class Finder implements ReaderInterface
 {
     /**
      * the finder
-     *
-     * @var SfFinder
      */
-    private $finder;
+    private SfFinder $finder;
 
     public function __construct(?string $name = null, ?SfFinder $finder = null)
     {
diff --git a/src/Naneau/ProjectVersioner/Reader/Finder/MTime.php b/src/Naneau/ProjectVersioner/Reader/Finder/MTime.php
index 4c3a4df..79a86b1 100644
--- a/src/Naneau/ProjectVersioner/Reader/Finder/MTime.php
+++ b/src/Naneau/ProjectVersioner/Reader/Finder/MTime.php
@@ -11,7 +11,7 @@ class MTime extends Finder
     /**
      * {@inheritdoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): int|string|null
     {
         $highest = 0;
         foreach ($this->getFinder() as $file) {
diff --git a/src/Naneau/ProjectVersioner/Reader/Git/Commit/Exec.php b/src/Naneau/ProjectVersioner/Reader/Git/Commit/Exec.php
index 4845eee..a758218 100644
--- a/src/Naneau/ProjectVersioner/Reader/Git/Commit/Exec.php
+++ b/src/Naneau/ProjectVersioner/Reader/Git/Commit/Exec.php
@@ -14,10 +14,8 @@ class Exec extends GitExec
 {
     /**
      * Use short hash?
-     *
-     * @var bool
      */
-    private $short = true;
+    private bool $short = true;
 
     public function __construct(bool $short = true)
     {
diff --git a/src/Naneau/ProjectVersioner/Reader/Git/Describe/Exec.php b/src/Naneau/ProjectVersioner/Reader/Git/Describe/Exec.php
index 2d1d7cd..bd8fe71 100644
--- a/src/Naneau/ProjectVersioner/Reader/Git/Describe/Exec.php
+++ b/src/Naneau/ProjectVersioner/Reader/Git/Describe/Exec.php
@@ -9,7 +9,7 @@
  * Reads the latest "described" version from git, which includes the latest
  * (reachable) tag, and a postfix for any commits added after that
  *
- * For example: 3.0.2-12-gd504031 for tag 3.0.2, with 12 additional commits,
+ * For example, 3.0.2-12-gd504031 for tag 3.0.2, with 12 additional commits,
  * the latest being gd504031
  *
  * @see http://git-scm.com/docs/git-describe
@@ -18,9 +18,6 @@ class Exec extends GitExec
 {
     /**
      * Get command for directory
-     *
-     * @param  string $directory
-     * @return string
      */
     protected function getCommandForDirectory(string $directory): string
     {
diff --git a/src/Naneau/ProjectVersioner/Reader/Git/Exec.php b/src/Naneau/ProjectVersioner/Reader/Git/Exec.php
index 5a156e1..c0c70d3 100644
--- a/src/Naneau/ProjectVersioner/Reader/Git/Exec.php
+++ b/src/Naneau/ProjectVersioner/Reader/Git/Exec.php
@@ -8,7 +8,7 @@
 /**
  * Exec
  *
- * Base class for exec based git reading
+ * Base class for exec-based git reading
  */
 abstract class Exec implements ReaderInterface
 {
@@ -26,7 +26,7 @@ public function canRead(string $directory): bool
     /**
      * {@inheritDoc}
      */
-    public function read(string $directory)
+    public function read(string $directory): int|string|null
     {
         return $this->exec(
             $this->getCommandForDirectory($directory)
@@ -63,7 +63,7 @@ private function canExec(string $command, string $directory): bool
     }
 
     /**
-     * Execute a git command and return first line of output
+     * Execute a git command and return the first line of output
      */
     private function exec(string $command): string
     {
diff --git a/src/Naneau/ProjectVersioner/Reader/Git/Tag/Exec.php b/src/Naneau/ProjectVersioner/Reader/Git/Tag/Exec.php
index 29033f0..6ba320d 100644
--- a/src/Naneau/ProjectVersioner/Reader/Git/Tag/Exec.php
+++ b/src/Naneau/ProjectVersioner/Reader/Git/Tag/Exec.php
@@ -6,9 +6,9 @@
 /**
  * Exec
  *
- * Reads the latest tag reachable from the current commit
+ * Reads the latest tag, reachable from the current commit
  *
- * For example: 3.0.2
+ * For example, 3.0.2
  *
  * @see http://git-scm.com/docs/git-describe
  */
diff --git a/src/Naneau/ProjectVersioner/ReaderInterface.php b/src/Naneau/ProjectVersioner/ReaderInterface.php
index 5193b86..8c4bb97 100644
--- a/src/Naneau/ProjectVersioner/ReaderInterface.php
+++ b/src/Naneau/ProjectVersioner/ReaderInterface.php
@@ -15,8 +15,6 @@ public function canRead(string $directory): bool;
 
     /**
      * Read the version from a directory
-     *
-     * @return string|int|null
      */
-    public function read(string $directory);
+    public function read(string $directory): int|string|null;
 }
diff --git a/src/Naneau/ProjectVersioner/Versioner.php b/src/Naneau/ProjectVersioner/Versioner.php
index cbbe066..46cc246 100644
--- a/src/Naneau/ProjectVersioner/Versioner.php
+++ b/src/Naneau/ProjectVersioner/Versioner.php
@@ -18,7 +18,7 @@ class Versioner
      *
      * @var Reader[]
      */
-    private $readers;
+    private array $readers;
 
     /**
      * Constructor
@@ -32,10 +32,8 @@ public function __construct(array $readers = [])
 
     /**
      * Get the version for a directory
-     *
-     * @return string|int|null
      */
-    public function get(string $directory)
+    public function get(string $directory): int|string|null
     {
         foreach ($this->getReaders() as $reader) {
             if ($reader->canRead($directory)) {
diff --git a/tests/Naneau/ProjectVersioner/Test/Reader/FinderTest.php b/tests/Naneau/ProjectVersioner/Test/Reader/FinderTest.php
index 71bbae3..6e669b8 100644
--- a/tests/Naneau/ProjectVersioner/Test/Reader/FinderTest.php
+++ b/tests/Naneau/ProjectVersioner/Test/Reader/FinderTest.php
@@ -15,7 +15,7 @@ public function testMtime(): void
 
         $versioner = new Versioner([new MTimeReader('*.txt')]);
 
-        // Set the time to now for one  of the files
+        // Set the time to now for one of the files
         $time = time();
         touch($directory . '/DirectoryOne/FileFour.txt', $time);
 
@@ -40,7 +40,7 @@ public function testEmptyNames(): void
 
         $versioner = new Versioner([new MTimeReader()]);
 
-        // Set the time to now for one  of the files
+        // Set the time to now for one of the files
         $time = time();
         touch($directory . '/DirectoryOne/FileFour.txt', $time);
 
diff --git a/tests/Naneau/ProjectVersioner/Test/Reader/GitExecTest.php b/tests/Naneau/ProjectVersioner/Test/Reader/GitExecTest.php
index 0142527..d465034 100644
--- a/tests/Naneau/ProjectVersioner/Test/Reader/GitExecTest.php
+++ b/tests/Naneau/ProjectVersioner/Test/Reader/GitExecTest.php
@@ -9,7 +9,7 @@
 class GitExecTest extends \PHPUnit\Framework\TestCase
 {
     /**
-     * Test reading of latest commit
+     * Test reading of the latest commit
      */
     public function testShortCommitRead(): void
     {