diff --git a/composer.json b/composer.json
index 12557914..5158d23f 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
 	"description": "Syntax highlighting extension for MediaWiki",
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
-		"mediawiki/mediawiki-codesniffer": "18.0.0",
+		"mediawiki/mediawiki-codesniffer": "20.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2",
 		"mediawiki/minus-x": "0.3.1",
 		"mediawiki/mediawiki-phan-config": "0.2.0"