diff --git a/.phpcs.xml b/.phpcs.xml
index 8505700..3e1822d 100644
--- a/.phpcs.xml
+++ b/.phpcs.xml
@@ -1,7 +1,6 @@
 <?xml version="1.0"?>
 <ruleset>
 	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki">
-		<exclude name="Squiz.Scope.MemberVarScope.Missing"/>
 		<exclude name="Squiz.Scope.MethodScope.Missing"/>
 	</rule>
 	<file>.</file>
diff --git a/composer.json b/composer.json
index 0cce66d..c473b7b 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
-		"mediawiki/mediawiki-codesniffer": "20.0.0",
+		"mediawiki/mediawiki-codesniffer": "21.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2",
 		"mediawiki/minus-x": "0.3.1",
 		"mediawiki/mediawiki-phan-config": "0.3.0"