diff --git a/.phpcs.xml b/.phpcs.xml
index 687fea510..0c14b3c48 100644
--- a/.phpcs.xml
+++ b/.phpcs.xml
@@ -7,6 +7,6 @@
 	</rule>
 
 	<file>.</file>
-	<arg name="extensions" value="php,php5,inc" />
+	<arg name="extensions" value="php" />
 	<arg name="encoding" value="UTF-8" />
 </ruleset>
diff --git a/composer.json b/composer.json
index f44829796..d53b7f42b 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
 	"require-dev": {
 		"php-parallel-lint/php-parallel-lint": "1.2.0",
-		"mediawiki/mediawiki-codesniffer": "31.0.0",
+		"mediawiki/mediawiki-codesniffer": "33.0.0",
 		"php-parallel-lint/php-console-highlighter": "0.5.0",
 		"mediawiki/minus-x": "1.1.0",
 		"mediawiki/mediawiki-phan-config": "0.10.2"