diff --git a/ResourceLoaderLessModule.php b/ResourceLoaderLessModule.php
index a9016012..d723f892 100644
--- a/ResourceLoaderLessModule.php
+++ b/ResourceLoaderLessModule.php
@@ -22,7 +22,6 @@
 
 namespace Vector;
 
-use ConfigFactory;
 use CSSMin;
 use MediaWiki\MediaWikiServices;
 use ResourceLoaderContext;
diff --git a/composer.json b/composer.json
index 78c2fa0e..5f9049b0 100644
--- a/composer.json
+++ b/composer.json
@@ -35,7 +35,7 @@
 	},
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "0.9.2",
-		"mediawiki/mediawiki-codesniffer": "0.12.0",
+		"mediawiki/mediawiki-codesniffer": "13.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2"
 	},
 	"scripts": {