diff --git a/composer.json b/composer.json
index 00799b14..1113b1de 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",
 		"mediawiki/lua-sandbox": "3.0.1",
 		"mediawiki/minus-x": "0.3.1",
 		"jakub-onderka/php-console-highlighter": "0.3.2",