diff --git a/.phpcs.xml b/.phpcs.xml
index 1dc29a912..85d67cb67 100644
--- a/.phpcs.xml
+++ b/.phpcs.xml
@@ -3,6 +3,7 @@
 	<rule ref="./vendor/mediawiki/mediawiki-codesniffer/MediaWiki">
 		<exclude name="MediaWiki.Commenting.FunctionComment.MissingDocumentationPublic" />
 		<exclude name="MediaWiki.WhiteSpace.SpaceBeforeSingleLineComment.NewLineComment" />
+		<exclude name="PSR12.Properties.ConstantVisibility.NotFound" />
 	</rule>
 	<file>.</file>
 	<arg name="extensions" value="php,php5,inc" />
diff --git a/composer.json b/composer.json
index 136672b59..0368732a2 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
-		"mediawiki/mediawiki-codesniffer": "26.0.0",
+		"mediawiki/mediawiki-codesniffer": "28.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2",
 		"mediawiki/minus-x": "0.3.1",
 		"mediawiki/mediawiki-phan-config": "0.6.1"