diff --git a/composer.json b/composer.json
index 7a88df7..fd0744f 100644
--- a/composer.json
+++ b/composer.json
@@ -1,12 +1,12 @@
 {
   "name": "ether/thumbro",
   "description": "Craft CMS image transformations powered by Thumbor",
-  "version": "1.0.8",
+  "version": "2.0.0",
   "type": "craft-plugin",
   "license": "proprietary",
   "minimum-stability": "dev",
   "require": {
-    "craftcms/cms": "^3.2.1"
+    "craftcms/cms": "^4"
   },
   "autoload": {
     "psr-4": {
diff --git a/src/Service.php b/src/Service.php
index 033add3..323b730 100644
--- a/src/Service.php
+++ b/src/Service.php
@@ -31,7 +31,7 @@ class Service extends Component
 	// Methods
 	// =========================================================================
 
-	public function init ()
+	public function init (): void
 	{
 		parent::init();
 
diff --git a/src/Thumbro.php b/src/Thumbro.php
index f9d7d7f..4166152 100644
--- a/src/Thumbro.php
+++ b/src/Thumbro.php
@@ -58,7 +58,7 @@ public function init ()
 	// Settings
 	// =========================================================================
 
-	protected function createSettingsModel ()
+	protected function createSettingsModel (): ?Model
 	{
 		return new Settings();
 	}
@@ -66,7 +66,7 @@ protected function createSettingsModel ()
 	/**
 	 * @return bool|Model|Settings
 	 */
-	public function getSettings ()
+	public function getSettings (): ?Model
 	{
 		return parent::getSettings();
 	}
diff --git a/src/ThumbroDirective.php b/src/ThumbroDirective.php
index f40251e..c4870a0 100644
--- a/src/ThumbroDirective.php
+++ b/src/ThumbroDirective.php
@@ -70,7 +70,7 @@ public static function name (): string
 	 */
 	public static function apply (
 		$source, $value, array $transform, ResolveInfo $resolveInfo
-	) {
+	): mixed {
 		$onAssetElement = $source === null && $value instanceof Asset;
 		$onAssetElementList = $source === null && is_array($value) && !empty($value);
 		$onApplicableAssetField = $source instanceof Asset && $resolveInfo->fieldName === 'url';