diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 691546075b..b5cd8c4f6e 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -1499,7 +1499,14 @@ function get_editor_stylesheets() {
 			}
 		}
 	}
-	return $stylesheets;
+	/**
+	 * Filter the array of stylesheets applied to the editor.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param array $stylesheets Array of stylesheets to be applied to the editor.
+	 */
+	return apply_filters( 'editor_stylesheets', $stylesheets );
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 316b4dbbc4..38ac1f4ccf 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-alpha-32927';
+$wp_version = '4.3-alpha-32928';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.