diff --git a/.stylelintrc b/.stylelintrc.json
similarity index 100%
rename from .stylelintrc
rename to .stylelintrc.json
diff --git a/composer.json b/composer.json
index d67d101d4..dfbb49e5d 100644
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
 		"jakub-onderka/php-console-highlighter": "0.4.0",
-		"mediawiki/mediawiki-codesniffer": "28.0.0",
+		"mediawiki/mediawiki-codesniffer": "29.0.0",
 		"mediawiki/minus-x": "0.3.2"
 	},
 	"scripts": {