diff --git a/wp-includes/kses.php b/wp-includes/kses.php
index 8722176718..6bbb7c977d 100644
--- a/wp-includes/kses.php
+++ b/wp-includes/kses.php
@@ -2279,6 +2279,7 @@ function kses_init() {
  *              Extended `margin-*` and `padding-*` support for logical properties.
  * @since 6.2.0 Added support for `aspect-ratio`, `position`, `top`, `right`, `bottom`, `left`,
  *              and `z-index` CSS properties.
+ * @since 6.3.0 Extended support for `filter` to accept a URL.
  *
  * @param string $css        A string of CSS rules.
  * @param string $deprecated Not used.
@@ -2466,6 +2467,7 @@ function safecss_filter_attr( $css, $deprecated = '' ) {
 		'background-image',
 
 		'cursor',
+		'filter',
 
 		'list-style',
 		'list-style-image',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c1e9896e98..77f9e1c9cb 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55563';
+$wp_version = '6.3-alpha-55564';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.