diff --git a/includes/Hooks.php b/includes/Hooks.php
index 26c1684..23fce66 100644
--- a/includes/Hooks.php
+++ b/includes/Hooks.php
@@ -12,20 +12,16 @@
 use MediaWiki\Revision\RevisionRecord;
 use Wikimedia\Rdbms\IConnectionProvider;
 
-class Hooks implements
+final class Hooks implements
 	BeforePageDisplayHook,
 	GetMagicVariableIDsHook,
 	PageDeleteCompleteHook,
 	ParserGetVariableValueSwitchHook
 {
 
-	private $connectionProvider;
-
 	public function __construct(
-		IConnectionProvider $connectionProvider
-	) {
-		$this->connectionProvider = $connectionProvider;
-	}
+		private IConnectionProvider $connectionProvider
+	) {}
 
 	public function onBeforePageDisplay( $out, $skin ): void {
 		$out->addModules( 'ext.hitcounters2.incrementcounter' );
diff --git a/includes/Installer.php b/includes/Installer.php
index 1127b54..7f2bf7c 100644
--- a/includes/Installer.php
+++ b/includes/Installer.php
@@ -4,7 +4,7 @@
 
 use MediaWiki\Installer\Hook\LoadExtensionSchemaUpdatesHook;
 
-class Installer implements LoadExtensionSchemaUpdatesHook {
+final class Installer implements LoadExtensionSchemaUpdatesHook {
 
 	public function onLoadExtensionSchemaUpdates( $updater ) {
 		$dbType = $updater->getDB()->getType();
diff --git a/includes/Rest/Handler/RestIncrementCounter.php b/includes/Rest/Handler/RestIncrementCounter.php
index 30f5044..b74a6d2 100644
--- a/includes/Rest/Handler/RestIncrementCounter.php
+++ b/includes/Rest/Handler/RestIncrementCounter.php
@@ -10,23 +10,16 @@
 use Wikimedia\ParamValidator\ParamValidator;
 use Wikimedia\Rdbms\IConnectionProvider;
 
-/*
+/**
  * Increments the hit counter for the specified page ID
  * POST /hitcounters2/v0/increment/{id}
  */
-class RestIncrementCounter extends SimpleHandler {
-
-	private $connectionProvider;
-
-	private $wikiPageFactory;
+final class RestIncrementCounter extends SimpleHandler {
 
 	public function __construct(
-		IConnectionProvider $connectionProvider,
-		WikiPageFactory $wikiPageFactory
-	) {
-		$this->connectionProvider = $connectionProvider;
-		$this->wikiPageFactory = $wikiPageFactory;
-	}
+		private IConnectionProvider $connectionProvider,
+		private WikiPageFactory $wikiPageFactory
+	) {}
 
 	public function run( int $pageID ) {
 		$body = $this->getValidatedBody();
diff --git a/includes/Specials/SpecialResetHitCounter.php b/includes/Specials/SpecialResetHitCounter.php
index a44596f..0ed13dc 100644
--- a/includes/Specials/SpecialResetHitCounter.php
+++ b/includes/Specials/SpecialResetHitCounter.php
@@ -7,16 +7,13 @@
 use MediaWiki\Title\Title;
 use Wikimedia\Rdbms\IConnectionProvider;
 
-class SpecialResetHitCounter extends FormSpecialPage {
-
-	private $connectionProvider;
+final class SpecialResetHitCounter extends FormSpecialPage {
 
 	private $page;
 
 	public function __construct(
-		IConnectionProvider $connectionProvider
+		private IConnectionProvider $connectionProvider
 	) {
-		$this->connectionProvider = $connectionProvider;
 		parent::__construct( 'ResetHitCounter', 'hitcounters2-resetcounter' );
 	}