diff --git a/.phpcs.xml b/.phpcs.xml
index 3c69313..b915cf8 100644
--- a/.phpcs.xml
+++ b/.phpcs.xml
@@ -2,6 +2,6 @@
 <ruleset>
 	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki" />
 	<file>.</file>
-	<arg name="extensions" value="php,php5,inc"/>
+	<arg name="extensions" value="php"/>
 	<arg name="encoding" value="UTF-8"/>
 </ruleset>
diff --git a/composer.json b/composer.json
index 41975fc..ae095ed 100644
--- a/composer.json
+++ b/composer.json
@@ -33,7 +33,7 @@
 		"installer-name": "Vector"
 	},
 	"require-dev": {
-		"mediawiki/mediawiki-codesniffer": "31.0.0",
+		"mediawiki/mediawiki-codesniffer": "33.0.0",
 		"mediawiki/mediawiki-phan-config": "0.10.2",
 		"mediawiki/minus-x": "1.1.0",
 		"php-parallel-lint/php-console-highlighter": "0.5.0",
diff --git a/includes/HTMLForm/Fields/HTMLLegacySkinVersionField.php b/includes/HTMLForm/Fields/HTMLLegacySkinVersionField.php
index 0acd7aa..148812d 100644
--- a/includes/HTMLForm/Fields/HTMLLegacySkinVersionField.php
+++ b/includes/HTMLForm/Fields/HTMLLegacySkinVersionField.php
@@ -26,7 +26,7 @@ use Wikimedia\Assert\Assert;
 final class HTMLLegacySkinVersionField extends \HTMLFormField {
 
 	/**
-	 * @var \HTMLCheckField $checkField
+	 * @var \HTMLCheckField
 	 */
 	private $checkField;