diff --git a/src/Dibi/DataSource.php b/src/Dibi/DataSource.php
index 89aa370..c7df9e0 100644
--- a/src/Dibi/DataSource.php
+++ b/src/Dibi/DataSource.php
@@ -15,8 +15,8 @@ namespace Dibi;
  */
 class DataSource implements IDataSource
 {
-	private Connection $connection;
-	private string $sql;
+	private readonly Connection $connection;
+	private readonly string $sql;
 	private ?Result $result = null;
 	private ?int $count = null;
 	private ?int $totalCount = null;
diff --git a/src/Dibi/Drivers/FirebirdReflector.php b/src/Dibi/Drivers/FirebirdReflector.php
index ea99289..9b23fdd 100644
--- a/src/Dibi/Drivers/FirebirdReflector.php
+++ b/src/Dibi/Drivers/FirebirdReflector.php
@@ -18,7 +18,7 @@ use Dibi;
 class FirebirdReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
+		private readonly Dibi\Driver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/MySqlReflector.php b/src/Dibi/Drivers/MySqlReflector.php
index d4e655d..0f968a7 100644
--- a/src/Dibi/Drivers/MySqlReflector.php
+++ b/src/Dibi/Drivers/MySqlReflector.php
@@ -19,7 +19,7 @@ use Dibi;
 class MySqlReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
+		private readonly Dibi\Driver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/MySqliResult.php b/src/Dibi/Drivers/MySqliResult.php
index 20f8aa7..c993c94 100644
--- a/src/Dibi/Drivers/MySqliResult.php
+++ b/src/Dibi/Drivers/MySqliResult.php
@@ -18,8 +18,8 @@ use Dibi;
 class MySqliResult implements Dibi\ResultDriver
 {
 	public function __construct(
-		private \mysqli_result $resultSet,
-		private bool $buffered,
+		private readonly \mysqli_result $resultSet,
+		private readonly bool $buffered,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/NoDataResult.php b/src/Dibi/Drivers/NoDataResult.php
index cec1547..480db59 100644
--- a/src/Dibi/Drivers/NoDataResult.php
+++ b/src/Dibi/Drivers/NoDataResult.php
@@ -18,7 +18,7 @@ use Dibi;
 class NoDataResult implements Dibi\ResultDriver
 {
 	public function __construct(
-		private int $rows,
+		private readonly int $rows,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/OdbcReflector.php b/src/Dibi/Drivers/OdbcReflector.php
index e922a49..0ec04a4 100644
--- a/src/Dibi/Drivers/OdbcReflector.php
+++ b/src/Dibi/Drivers/OdbcReflector.php
@@ -18,7 +18,7 @@ use Dibi;
 class OdbcReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
+		private readonly Dibi\Driver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/OracleReflector.php b/src/Dibi/Drivers/OracleReflector.php
index 031d78f..1ab4962 100644
--- a/src/Dibi/Drivers/OracleReflector.php
+++ b/src/Dibi/Drivers/OracleReflector.php
@@ -18,7 +18,7 @@ use Dibi;
 class OracleReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
+		private readonly Dibi\Driver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/PdoResult.php b/src/Dibi/Drivers/PdoResult.php
index f88d9f9..bfb0f60 100644
--- a/src/Dibi/Drivers/PdoResult.php
+++ b/src/Dibi/Drivers/PdoResult.php
@@ -21,7 +21,7 @@ class PdoResult implements Dibi\ResultDriver
 {
 	public function __construct(
 		private ?\PDOStatement $resultSet,
-		private string $driverName,
+		private readonly string $driverName,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/PostgreReflector.php b/src/Dibi/Drivers/PostgreReflector.php
index 5bda3b9..68679d3 100644
--- a/src/Dibi/Drivers/PostgreReflector.php
+++ b/src/Dibi/Drivers/PostgreReflector.php
@@ -18,8 +18,8 @@ use Dibi;
 class PostgreReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
-		private string $version,
+		private readonly Dibi\Driver $driver,
+		private readonly string $version,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/PostgreResult.php b/src/Dibi/Drivers/PostgreResult.php
index 62851e3..e74f36c 100644
--- a/src/Dibi/Drivers/PostgreResult.php
+++ b/src/Dibi/Drivers/PostgreResult.php
@@ -20,7 +20,7 @@ use PgSql;
 class PostgreResult implements Dibi\ResultDriver
 {
 	public function __construct(
-		private PgSql\Result $resultSet,
+		private readonly PgSql\Result $resultSet,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/SqliteReflector.php b/src/Dibi/Drivers/SqliteReflector.php
index a8ce36c..8c1e3ad 100644
--- a/src/Dibi/Drivers/SqliteReflector.php
+++ b/src/Dibi/Drivers/SqliteReflector.php
@@ -18,7 +18,7 @@ use Dibi;
 class SqliteReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
+		private readonly Dibi\Driver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/SqliteResult.php b/src/Dibi/Drivers/SqliteResult.php
index 2c26e95..c3fef40 100644
--- a/src/Dibi/Drivers/SqliteResult.php
+++ b/src/Dibi/Drivers/SqliteResult.php
@@ -19,7 +19,7 @@ use Dibi\Helpers;
 class SqliteResult implements Dibi\ResultDriver
 {
 	public function __construct(
-		private \SQLite3Result $resultSet,
+		private readonly \SQLite3Result $resultSet,
 	) {
 	}
 
diff --git a/src/Dibi/Drivers/SqlsrvReflector.php b/src/Dibi/Drivers/SqlsrvReflector.php
index 386cbb1..b19249a 100644
--- a/src/Dibi/Drivers/SqlsrvReflector.php
+++ b/src/Dibi/Drivers/SqlsrvReflector.php
@@ -18,7 +18,7 @@ use Dibi;
 class SqlsrvReflector implements Dibi\Reflector
 {
 	public function __construct(
-		private Dibi\Driver $driver,
+		private readonly Dibi\Driver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Event.php b/src/Dibi/Event.php
index 92f4a16..9b9e879 100644
--- a/src/Dibi/Event.php
+++ b/src/Dibi/Event.php
@@ -29,10 +29,10 @@ class Event
 		TRANSACTION = 448, // BEGIN | COMMIT | ROLLBACK
 		ALL = 1023;
 
-	public Connection $connection;
+	public readonly Connection $connection;
 	public int $type;
-	public string $sql;
-	public Result|DriverException|null $result;
+	public readonly string $sql;
+	public readonly Result|DriverException|null $result;
 	public float $time;
 	public ?int $count = null;
 	public ?array $source = null;
diff --git a/src/Dibi/Expression.php b/src/Dibi/Expression.php
index e550299..c3f1749 100644
--- a/src/Dibi/Expression.php
+++ b/src/Dibi/Expression.php
@@ -15,7 +15,7 @@ namespace Dibi;
  */
 class Expression
 {
-	private array $values;
+	private readonly array $values;
 
 
 	public function __construct(...$values)
diff --git a/src/Dibi/Fluent.php b/src/Dibi/Fluent.php
index c24c06e..2922e92 100644
--- a/src/Dibi/Fluent.php
+++ b/src/Dibi/Fluent.php
@@ -97,7 +97,7 @@ class Fluent implements IDataSource
 		'RIGHT JOIN' => 'FROM',
 	];
 
-	private Connection $connection;
+	private readonly Connection $connection;
 	private array $setups = [];
 	private ?string $command = null;
 	private array $clauses = [];
diff --git a/src/Dibi/Literal.php b/src/Dibi/Literal.php
index ca39585..15eecdf 100644
--- a/src/Dibi/Literal.php
+++ b/src/Dibi/Literal.php
@@ -15,7 +15,7 @@ namespace Dibi;
  */
 class Literal
 {
-	private string $value;
+	private readonly string $value;
 
 
 	public function __construct($value)
diff --git a/src/Dibi/Reflection/Column.php b/src/Dibi/Reflection/Column.php
index 44ed7f1..0ae1e58 100644
--- a/src/Dibi/Reflection/Column.php
+++ b/src/Dibi/Reflection/Column.php
@@ -28,7 +28,7 @@ use Dibi;
 class Column
 {
 	public function __construct(
-		private ?Dibi\Reflector $reflector,
+		private readonly ?Dibi\Reflector $reflector,
 		private array $info,
 	) {
 	}
diff --git a/src/Dibi/Reflection/Database.php b/src/Dibi/Reflection/Database.php
index 6a11ab7..d471c7d 100644
--- a/src/Dibi/Reflection/Database.php
+++ b/src/Dibi/Reflection/Database.php
@@ -26,7 +26,7 @@ class Database
 
 
 	public function __construct(
-		private Dibi\Reflector $reflector,
+		private readonly Dibi\Reflector $reflector,
 		private ?string $name = null,
 	) {
 	}
diff --git a/src/Dibi/Reflection/ForeignKey.php b/src/Dibi/Reflection/ForeignKey.php
index 68730b0..c7f005b 100644
--- a/src/Dibi/Reflection/ForeignKey.php
+++ b/src/Dibi/Reflection/ForeignKey.php
@@ -20,8 +20,8 @@ namespace Dibi\Reflection;
 class ForeignKey
 {
 	public function __construct(
-		private string $name,
-		private array $references,
+		private readonly string $name,
+		private readonly array $references,
 	) {
 	}
 
diff --git a/src/Dibi/Reflection/Index.php b/src/Dibi/Reflection/Index.php
index 29739f3..71e426c 100644
--- a/src/Dibi/Reflection/Index.php
+++ b/src/Dibi/Reflection/Index.php
@@ -22,7 +22,7 @@ namespace Dibi\Reflection;
 class Index
 {
 	public function __construct(
-		private array $info,
+		private readonly array $info,
 	) {
 	}
 
diff --git a/src/Dibi/Reflection/Result.php b/src/Dibi/Reflection/Result.php
index f62b523..2218f08 100644
--- a/src/Dibi/Reflection/Result.php
+++ b/src/Dibi/Reflection/Result.php
@@ -28,7 +28,7 @@ class Result
 
 
 	public function __construct(
-		private Dibi\ResultDriver $driver,
+		private readonly Dibi\ResultDriver $driver,
 	) {
 	}
 
diff --git a/src/Dibi/Reflection/Table.php b/src/Dibi/Reflection/Table.php
index b03d480..7c5b64e 100644
--- a/src/Dibi/Reflection/Table.php
+++ b/src/Dibi/Reflection/Table.php
@@ -25,7 +25,7 @@ use Dibi;
  */
 class Table
 {
-	private Dibi\Reflector $reflector;
+	private readonly Dibi\Reflector $reflector;
 	private string $name;
 	private bool $view;
 
diff --git a/src/Dibi/ResultIterator.php b/src/Dibi/ResultIterator.php
index d47ff88..6bac6b5 100644
--- a/src/Dibi/ResultIterator.php
+++ b/src/Dibi/ResultIterator.php
@@ -20,7 +20,7 @@ class ResultIterator implements \Iterator, \Countable
 
 
 	public function __construct(
-		private Result $result,
+		private readonly Result $result,
 	) {
 	}
 
diff --git a/src/Dibi/Translator.php b/src/Dibi/Translator.php
index e20ee05..8dc4063 100644
--- a/src/Dibi/Translator.php
+++ b/src/Dibi/Translator.php
@@ -15,8 +15,8 @@ namespace Dibi;
  */
 final class Translator
 {
-	private Connection $connection;
-	private Driver $driver;
+	private readonly Connection $connection;
+	private readonly Driver $driver;
 	private int $cursor = 0;
 	private array $args;