diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed7fe33..636e27f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.0.0] 2023-11-15
+
+### Changed
+
+- All implementations of Data are now `readonly`
+- KeyedData constructor changed from `private` to `public`
+
 ## [1.2.0] 2023-11-11
 
 ### Added
diff --git a/src/DataProxy.php b/src/DataProxy.php
index dbe3c2e..dbc70a0 100644
--- a/src/DataProxy.php
+++ b/src/DataProxy.php
@@ -4,7 +4,7 @@
 
 namespace Focus\Data;
 
-abstract class DataProxy implements Data
+abstract readonly class DataProxy implements Data
 {
     abstract protected function source(): Data;
 
diff --git a/src/JsonData.php b/src/JsonData.php
index 48a897d..d7542a2 100644
--- a/src/JsonData.php
+++ b/src/JsonData.php
@@ -13,7 +13,7 @@
 
 use const JSON_THROW_ON_ERROR;
 
-final class JsonData extends DataProxy
+final readonly class JsonData extends DataProxy
 {
     use DataProxyBehavior;
 
diff --git a/src/KeyedData.php b/src/KeyedData.php
index 02c90a3..b7d57f5 100644
--- a/src/KeyedData.php
+++ b/src/KeyedData.php
@@ -44,7 +44,7 @@ public static function tryFrom(mixed $value): self
         );
     }
 
-    private function __construct(
+    public function __construct(
         private array|object $value = new stdClass(),
     ) {
     }
diff --git a/tests/KeyedDataTest.php b/tests/KeyedDataTest.php
index f6a41e4..331ea97 100644
--- a/tests/KeyedDataTest.php
+++ b/tests/KeyedDataTest.php
@@ -58,7 +58,7 @@ public static function unsupportedValues(): array
 
     public function testFromShouldCreateInstance(): void
     {
-        $data = KeyedData::from(self::$fixture);
+        $data = new KeyedData(self::$fixture);
 
         self::assertInstanceOf(
             expected: KeyedData::class,
diff --git a/tests/ProxiesData.php b/tests/ProxiesData.php
index 026d586..5c32d26 100644
--- a/tests/ProxiesData.php
+++ b/tests/ProxiesData.php
@@ -7,7 +7,7 @@
 use Focus\Data\Behavior\DataProxyBehavior;
 use Focus\Data\DataProxy;
 
-final class ProxiesData extends DataProxy
+final readonly class ProxiesData extends DataProxy
 {
     use DataProxyBehavior;
 }