diff --git a/.github/workflows/code-checks.yml b/.github/workflows/code-checks.yml
index 4f751c0..d57ddf2 100644
--- a/.github/workflows/code-checks.yml
+++ b/.github/workflows/code-checks.yml
@@ -11,8 +11,6 @@ jobs:
     strategy:
       matrix:
         php:
-          - '7.4'
-          - '8.0'
           - '8.1'
           - '8.2'
           - '8.3'
diff --git a/.gitignore b/.gitignore
index 4901aab..a3ee6db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-/vendor
+/.phpunit.cache/
+/vendor/
 /composer.lock
-/.phpunit.result.cache
diff --git a/.runConfigurations/All unit tests.run.xml b/.runConfigurations/All unit tests.run.xml
index 0a179b1..1c5c127 100644
--- a/.runConfigurations/All unit tests.run.xml	
+++ b/.runConfigurations/All unit tests.run.xml	
@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All unit tests" type="PHPUnitRunConfigurationType" factoryName="PHPUnit">
-    <TestRunner configuration_file="$PROJECT_DIR$/phpunit.xml.dist" directory="$PROJECT_DIR$/tests" scope="XML" options="--verbose" />
+    <TestRunner configuration_file="$PROJECT_DIR$/phpunit.xml.dist" directory="$PROJECT_DIR$/tests" scope="XML" />
     <method v="2" />
   </configuration>
 </component>
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3a84367..5a08844 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Removed
+- **BC break**: Removed support for PHP versions <= v8.0 as they are no longer
+  [actively supported](https://php.net/supported-versions.php) by the PHP project.
 
 ## [1.0.1] - 2025-02-08
 ### Changed
diff --git a/composer.json b/composer.json
index 0f9bd25..6d4cfda 100644
--- a/composer.json
+++ b/composer.json
@@ -13,12 +13,12 @@
         }
     ],
     "require": {
-        "php": "^7.4 || ^8.0",
+        "php": "^8.1",
         "phlib/db": "^2",
-        "symfony/process": "^5 || ^6 || ^7"
+        "symfony/process": "^6 || ^7"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9",
+        "phpunit/phpunit": "^10",
         "symplify/easy-coding-standard": "^12"
     },
     "autoload": {
diff --git a/ecs.php b/ecs.php
index c705127..86501dc 100644
--- a/ecs.php
+++ b/ecs.php
@@ -48,4 +48,19 @@
         [
             'closure_fn_spacing' => 'none',
         ],
+    )
+
+    /*
+     * Rule from PER Coding Style 2.6:
+     * "If the list is split across multiple lines, then the last item MUST have a trailing comma."
+     */
+    ->withConfiguredRule(
+        \PhpCsFixer\Fixer\ControlStructure\TrailingCommaInMultilineFixer::class,
+        [
+            'elements' => [
+                \PhpCsFixer\Fixer\ControlStructure\TrailingCommaInMultilineFixer::ELEMENTS_ARGUMENTS,
+                \PhpCsFixer\Fixer\ControlStructure\TrailingCommaInMultilineFixer::ELEMENTS_ARRAYS,
+                \PhpCsFixer\Fixer\ControlStructure\TrailingCommaInMultilineFixer::ELEMENTS_PARAMETERS,
+            ],
+        ],
     );
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 6c17a6a..d7805a3 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
     bootstrap="vendor/autoload.php"
     beStrictAboutOutputDuringTests="true"
+    cacheDirectory=".phpunit.cache"
     colors="true"
 >
     <testsuites>
@@ -11,9 +12,9 @@
             <directory>tests</directory>
         </testsuite>
     </testsuites>
-    <coverage>
+    <source>
         <include>
             <directory suffix=".php">src</directory>
         </include>
-    </coverage>
+    </source>
 </phpunit>
diff --git a/src/Column.php b/src/Column.php
index d4be608..febc2c0 100644
--- a/src/Column.php
+++ b/src/Column.php
@@ -6,7 +6,7 @@
 
 use Phlib\Db\SqlFragment;
 
-class Column
+class Column implements \Stringable
 {
     use FormatterTrait;
 
@@ -14,10 +14,6 @@ class Column
 
     private const POSITION_AFTER = 'AFTER';
 
-    private string $name;
-
-    private string $type;
-
     private string $newName;
 
     private bool $unsigned;
@@ -28,20 +24,18 @@ class Column
 
     private bool $nullable = true;
 
-    /**
-     * @var string|SqlFragment
-     */
-    private $default;
+    private string|SqlFragment $default;
 
     private bool $auto;
 
     private array $position;
 
-    public function __construct(Formatter $formatter, string $name, string $type)
-    {
+    public function __construct(
+        Formatter $formatter,
+        private readonly string $name,
+        private string $type,
+    ) {
         $this->formatter = $formatter;
-        $this->name = $name;
-        $this->type = $type;
     }
 
     public function getName(): string
@@ -150,7 +144,7 @@ public function toSql(): string
             if (!$value instanceof SqlFragment) {
                 $value = $this->quoteValue($value);
             }
-            $definition[] = 'DEFAULT ' . (string)$value;
+            $definition[] = 'DEFAULT ' . $value;
         }
 
         if (isset($this->auto) && $this->auto === true) {
diff --git a/src/Formatter/Db.php b/src/Formatter/Db.php
index 01610f4..9c7b856 100644
--- a/src/Formatter/Db.php
+++ b/src/Formatter/Db.php
@@ -10,13 +10,11 @@
 
 class Db implements Formatter
 {
-    private Adapter $db;
-
     private NameMapper $nameMapper;
 
-    public function __construct(Adapter $db)
-    {
-        $this->db = $db;
+    public function __construct(
+        private readonly Adapter $db,
+    ) {
     }
 
     public function setNameMapper(NameMapper $nameMapper): void
diff --git a/src/Formatter/TestFake.php b/src/Formatter/TestFake.php
index 2fe449b..9a02aef 100644
--- a/src/Formatter/TestFake.php
+++ b/src/Formatter/TestFake.php
@@ -11,7 +11,6 @@ class TestFake implements Formatter
 {
     public function setNameMapper(NameMapper $nameMapper): void
     {
-        return;
     }
 
     public function tableIdentifier(string $tableIdentifier): string
diff --git a/src/FormatterTrait.php b/src/FormatterTrait.php
index a626ceb..62f132c 100644
--- a/src/FormatterTrait.php
+++ b/src/FormatterTrait.php
@@ -6,7 +6,7 @@
 
 trait FormatterTrait
 {
-    protected Formatter $formatter;
+    protected readonly Formatter $formatter;
 
     protected function tableIdentifier(string $tableIdentifer): string
     {
diff --git a/src/Index.php b/src/Index.php
index 853f323..3881cfe 100644
--- a/src/Index.php
+++ b/src/Index.php
@@ -4,12 +4,10 @@
 
 namespace Phlib\SchemaChange;
 
-class Index
+class Index implements \Stringable
 {
     use FormatterTrait;
 
-    private string $tableName;
-
     private string $name;
 
     private array $columns;
@@ -18,11 +16,10 @@ class Index
 
     public function __construct(
         Formatter $formatter,
-        string $tableName,
-        string ...$columns
+        private readonly string $tableName,
+        string ...$columns,
     ) {
         $this->formatter = $formatter;
-        $this->tableName = $tableName;
         $this->columns = $columns;
     }
 
diff --git a/src/OnlineChangeRunner.php b/src/OnlineChangeRunner.php
index 8a63cd2..c1c02e9 100644
--- a/src/OnlineChangeRunner.php
+++ b/src/OnlineChangeRunner.php
@@ -10,18 +10,15 @@
 
 class OnlineChangeRunner
 {
-    private string $binPath;
-
     /**
-     * @var \Closure {
-     *     @return Process
-     * }
+     * @var \Closure():Process
      */
-    private \Closure $processFactory;
+    private readonly \Closure $processFactory;
 
-    public function __construct(string $binPath, ?\Closure $processFactory = null)
-    {
-        $this->binPath = $binPath;
+    public function __construct(
+        private readonly string $binPath,
+        ?\Closure $processFactory = null,
+    ) {
         $this->processFactory = $processFactory ?? static function (...$args): Process {
             return new Process(...$args);
         };
@@ -32,7 +29,7 @@ public function execute(array $dbConfig, OnlineChange $onlineChange): void
         $cmd = array_merge(
             [$this->binPath, $this->buildDsn($dbConfig, $onlineChange->getName())],
             $this->getOptions($onlineChange),
-            ['--alter', $onlineChange->toOnlineAlter()]
+            ['--alter', $onlineChange->toOnlineAlter()],
         );
         $process = $this->getProcess($cmd);
 
@@ -80,7 +77,7 @@ private function buildDsn(array $dbConfig, string $tableName): string
         return $dsn;
     }
 
-    private function getProcess(...$args): Process
+    private function getProcess(array ...$args): Process
     {
         return ($this->processFactory)(...$args);
     }
diff --git a/src/SchemaChange.php b/src/SchemaChange.php
index 5861c46..00bda38 100644
--- a/src/SchemaChange.php
+++ b/src/SchemaChange.php
@@ -14,17 +14,14 @@
 
 class SchemaChange
 {
-    private Adapter $db;
+    private readonly Formatter $formatter;
 
-    private Formatter $formatter;
-
-    private ?OnlineChangeRunner $onlineChangeRunner;
-
-    public function __construct(Adapter $db, OnlineChangeRunner $onlineChangeRunner = null, Formatter $formatter = null)
-    {
-        $this->db = $db;
+    public function __construct(
+        private readonly Adapter $db,
+        private readonly ?OnlineChangeRunner $onlineChangeRunner = null,
+        Formatter $formatter = null,
+    ) {
         $this->formatter = $formatter ?? new DbFormatter($this->db);
-        $this->onlineChangeRunner = $onlineChangeRunner;
     }
 
     public function mapNames(NameMapper $nameMapper): void
diff --git a/src/Table.php b/src/Table.php
index 2825329..6f08b6c 100644
--- a/src/Table.php
+++ b/src/Table.php
@@ -8,11 +8,10 @@ abstract class Table implements Change
 {
     use FormatterTrait;
 
-    protected string $table;
-
-    public function __construct(Formatter $formatter, string $table)
-    {
+    public function __construct(
+        Formatter $formatter,
+        protected readonly string $table,
+    ) {
         $this->formatter = $formatter;
-        $this->table = $table;
     }
 }
diff --git a/src/Table/Alter.php b/src/Table/Alter.php
index e1ae8ee..f52d0b8 100644
--- a/src/Table/Alter.php
+++ b/src/Table/Alter.php
@@ -94,9 +94,7 @@ public function toSql(): string
         $tableName = $this->tableIdentifier($this->table);
         $ddl = "ALTER TABLE {$tableName}\n";
 
-        $ddl .= $this->getCmds();
-
-        return $ddl;
+        return $ddl . $this->getCmds();
     }
 
     public function toOnlineAlter(): string
@@ -117,7 +115,7 @@ private function getCmds(): string
         }
         // add columns
         foreach ($this->addColumns as $column) {
-            $cmds[] = 'ADD ' . (string)$column;
+            $cmds[] = 'ADD ' . $column;
         }
         // drop column defaults
         foreach ($this->dropDefaultColumns as $columnName) {
@@ -127,7 +125,7 @@ private function getCmds(): string
         // change columns
         foreach ($this->changeColumns as $column) {
             $columnName = $this->quoteIdentifier($column->getName());
-            $cmds[] = 'CHANGE COLUMN ' . $columnName . ' ' . (string)$column;
+            $cmds[] = 'CHANGE COLUMN ' . $columnName . ' ' . $column;
         }
         // remove fields
         foreach ($this->removeColumns as $column) {
@@ -143,7 +141,7 @@ private function getCmds(): string
         }
         // add indexes (key)
         foreach ($this->addIndexes as $index) {
-            $cmds[] = 'ADD ' . (string)$index;
+            $cmds[] = 'ADD ' . $index;
         }
         // remove indexes (key)
         foreach ($this->removeIndexes as $index) {
diff --git a/tests/Formatter/DbTest.php b/tests/Formatter/DbTest.php
index 3450ae5..6b78380 100644
--- a/tests/Formatter/DbTest.php
+++ b/tests/Formatter/DbTest.php
@@ -12,15 +12,9 @@
 
 class DbTest extends TestCase
 {
-    /**
-     * @var Adapter|MockObject
-     */
-    private $db;
-
-    /**
-     * @var Adapter\QuoteHandler|MockObject
-     */
-    private $quoter;
+    private Adapter&MockObject $db;
+
+    private Adapter\QuoteHandler&MockObject $quoter;
 
     protected function setUp(): void
     {