diff --git a/wp-includes/style-engine/class-wp-style-engine.php b/wp-includes/style-engine/class-wp-style-engine.php
index 7aab1cbb22..c6554c5dd9 100644
--- a/wp-includes/style-engine/class-wp-style-engine.php
+++ b/wp-includes/style-engine/class-wp-style-engine.php
@@ -14,13 +14,14 @@
  *
  * The Style Engine aims to provide a consistent API for rendering styling for blocks across both client-side and server-side applications.
  *
+ * This class is final and should not be extended.
  * This class is for internal Core usage and is not supposed to be used by extenders (plugins and/or themes).
  * This is a low-level API that may need to do breaking changes. Please, use wp_style_engine_get_styles instead.
  *
  * @access private
  * @since 6.1.0
  */
-class WP_Style_Engine {
+final class WP_Style_Engine {
 	/**
 	 * Style definitions that contain the instructions to
 	 * parse/output valid Gutenberg styles from a block's attributes.
@@ -107,28 +108,28 @@ class WP_Style_Engine {
 				'path'          => array( 'border', 'width' ),
 			),
 			'top'    => array(
-				'value_func' => 'static::get_individual_property_css_declarations',
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
 				'path'       => array( 'border', 'top' ),
 				'css_vars'   => array(
 					'color' => '--wp--preset--color--$slug',
 				),
 			),
 			'right'  => array(
-				'value_func' => 'static::get_individual_property_css_declarations',
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
 				'path'       => array( 'border', 'right' ),
 				'css_vars'   => array(
 					'color' => '--wp--preset--color--$slug',
 				),
 			),
 			'bottom' => array(
-				'value_func' => 'static::get_individual_property_css_declarations',
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
 				'path'       => array( 'border', 'bottom' ),
 				'css_vars'   => array(
 					'color' => '--wp--preset--color--$slug',
 				),
 			),
 			'left'   => array(
-				'value_func' => 'static::get_individual_property_css_declarations',
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
 				'path'       => array( 'border', 'left' ),
 				'css_vars'   => array(
 					'color' => '--wp--preset--color--$slug',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index baad42a7fb..fdcd857993 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta2-54356';
+$wp_version = '6.1-beta2-54357';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.