diff --git a/bootstrap.php b/bootstrap.php
index d7cf7ac..74890e4 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -8,10 +8,10 @@
 	return;
 }
 
-define( 'MWSTAKE_MEDIAWIKI_COMPONENT_NOTIFICATIONS_VERSION', '2.0.1' );
+define( 'MWSTAKE_MEDIAWIKI_COMPONENT_NOTIFICATIONS_VERSION', '2.0.2' );
 
 MWStake\MediaWiki\ComponentLoader\Bootstrapper::getInstance()
-->register( 'notifications', function () {
+->register( 'notifications', static function () {
 	$GLOBALS['wgMessagesDirs']['MWStakeMediaWikiComponentNotifications'] = __DIR__ . '/i18n';
 
 	$GLOBALS['mwsgNotificationsNotifierSpec'] = [
diff --git a/composer.json b/composer.json
index 9c53000..1f9c9c0 100644
--- a/composer.json
+++ b/composer.json
@@ -13,10 +13,10 @@
 		"mwstake/mediawiki-componentloader": "~1"
 	},
 	"require-dev": {
-		"jakub-onderka/php-parallel-lint": "1.0.0",
-		"jakub-onderka/php-console-highlighter": "0.4.0",
-		"mediawiki/mediawiki-codesniffer": "29.0.0",
-		"mediawiki/minus-x": "1.0.0"
+		"mediawiki/mediawiki-codesniffer": "41.0.0",
+		"mediawiki/minus-x": "1.1.1",
+		"php-parallel-lint/php-console-highlighter": "1.0.0",
+		"php-parallel-lint/php-parallel-lint": "1.3.2"
 	},
 	"autoload": {
 		"psr-4": {
diff --git a/includes/ServiceWiring.php b/includes/ServiceWiring.php
index 7559398..bd62539 100644
--- a/includes/ServiceWiring.php
+++ b/includes/ServiceWiring.php
@@ -5,7 +5,7 @@
 use MWStake\MediaWiki\Component\Notifications\NullNotifier;
 
 return [
-	'MWStakeNotificationsNotifier' => function ( MediaWikiServices $services ) {
+	'MWStakeNotificationsNotifier' => static function ( MediaWikiServices $services ) {
 		$spec = $GLOBALS['mwsgNotificationsNotifierSpec'];
 		$instance = $services->getObjectFactory()->createObject( $spec );
 		if ( !$instance instanceof INotifier ) {
diff --git a/src/BaseNotification.php b/src/BaseNotification.php
index 851dc51..f4ba90d 100644
--- a/src/BaseNotification.php
+++ b/src/BaseNotification.php
@@ -40,13 +40,13 @@ class BaseNotification implements INotification {
 
 	/**
 	 *
-	 * @var boolean
+	 * @var bool
 	 */
 	protected $immediateEmail = false;
 
 	/**
 	 *
-	 * @var boolean
+	 * @var bool
 	 */
 	protected $useJobQueue = true;
 
@@ -252,7 +252,7 @@ private function getUserInGroups( $groups ) {
 			return $users;
 		}
 		foreach ( $res as $row ) {
-			$users [] = User::newFromId( $row->ug_user );
+			$users[] = User::newFromId( $row->ug_user );
 		}
 		return $users;
 	}
diff --git a/src/INotification.php b/src/INotification.php
index 70b34f7..d515066 100644
--- a/src/INotification.php
+++ b/src/INotification.php
@@ -35,7 +35,7 @@ public function getSecondaryLinks();
 	 * Whether mail for this notification should
 	 * be sent immediately regardless of user settings
 	 *
-	 * @return boolean
+	 * @return bool
 	 */
 	public function sendImmediateEmail();
 
@@ -43,7 +43,7 @@ public function sendImmediateEmail();
 	 * Whether job queue should be used
 	 * to send this notification
 	 *
-	 * @return boolean
+	 * @return bool
 	 */
 	public function useJobQueue();
 
diff --git a/src/NullNotification.php b/src/NullNotification.php
index b894079..1e81375 100644
--- a/src/NullNotification.php
+++ b/src/NullNotification.php
@@ -9,6 +9,8 @@
  * Generic empty notification
  */
 class NullNotification implements INotification {
+
+	/** @var string */
 	protected $key;
 
 	/**