diff --git a/composer.json b/composer.json
index 8ec4c9d..cd57ce2 100644
--- a/composer.json
+++ b/composer.json
@@ -26,7 +26,7 @@
 		"composer/installers": ">=1.0.1"
 	},
 	"require-dev": {
-		"mediawiki/mediawiki-codesniffer": "36.0.0",
+		"mediawiki/mediawiki-codesniffer": "39.0.0",
 		"mediawiki/mediawiki-phan-config": "0.11.1",
 		"mediawiki/minus-x": "1.1.1",
 		"php-parallel-lint/php-console-highlighter": "0.5.0",