diff --git a/composer.json b/composer.json
index 7c4af8b9f..9811f68f9 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
 	"require-dev": {
 		"mediawiki/mediawiki-codesniffer": "39.0.0",
-		"mediawiki/mediawiki-phan-config": "0.11.1",
+		"mediawiki/mediawiki-phan-config": "0.12.0",
 		"mediawiki/minus-x": "1.1.1",
 		"php-parallel-lint/php-console-highlighter": "1.0.0",
 		"php-parallel-lint/php-parallel-lint": "1.3.2"
diff --git a/src/TexVC/Nodes/Matrix.php b/src/TexVC/Nodes/Matrix.php
index c5df5dd4e..d161f1be2 100644
--- a/src/TexVC/Nodes/Matrix.php
+++ b/src/TexVC/Nodes/Matrix.php
@@ -49,7 +49,7 @@ class Matrix extends TexNode {
 	}
 
 	private function renderMatrix( $matrix ) {
-		$mapped = array_map( 'self::renderLine', $matrix->args );
+		$mapped = array_map( [ self::class, 'renderLine' ], $matrix->args );
 		return implode( '\\\\', $mapped );
 	}
 
@@ -79,7 +79,7 @@ class Matrix extends TexNode {
 			return $a;
 		}
 
-		$reduced = array_reduce( $a, 'self::reduceCallback', [] );
+		$reduced = array_reduce( $a, [ self::class, 'reduceCallback' ], [] );
 		return $reduced;
 	}