diff --git a/wp-admin/includes/class-bulk-upgrader-skin.php b/wp-admin/includes/class-bulk-upgrader-skin.php
index d09b0e9fcc..89367c4cf8 100644
--- a/wp-admin/includes/class-bulk-upgrader-skin.php
+++ b/wp-admin/includes/class-bulk-upgrader-skin.php
@@ -89,18 +89,20 @@ class Bulk_Upgrader_Skin extends WP_Upgrader_Skin {
 	}
 
 	/**
-	 * @param string|WP_Error $error
+	 * @since 5.9.0 Renamed `$error` to `$errors` for PHP 8 named parameter support.
+	 *
+	 * @param string|WP_Error $errors Errors.
 	 */
-	public function error( $error ) {
-		if ( is_string( $error ) && isset( $this->upgrader->strings[ $error ] ) ) {
-			$this->error = $this->upgrader->strings[ $error ];
+	public function error( $errors ) {
+		if ( is_string( $errors ) && isset( $this->upgrader->strings[ $errors ] ) ) {
+			$this->error = $this->upgrader->strings[ $errors ];
 		}
 
-		if ( is_wp_error( $error ) ) {
+		if ( is_wp_error( $errors ) ) {
 			$messages = array();
-			foreach ( $error->get_error_messages() as $emessage ) {
-				if ( $error->get_error_data() && is_string( $error->get_error_data() ) ) {
-					$messages[] = $emessage . ' ' . esc_html( strip_tags( $error->get_error_data() ) );
+			foreach ( $errors->get_error_messages() as $emessage ) {
+				if ( $errors->get_error_data() && is_string( $errors->get_error_data() ) ) {
+					$messages[] = $emessage . ' ' . esc_html( strip_tags( $errors->get_error_data() ) );
 				} else {
 					$messages[] = $emessage;
 				}
diff --git a/wp-admin/includes/class-language-pack-upgrader-skin.php b/wp-admin/includes/class-language-pack-upgrader-skin.php
index 05676269f0..57b0a1c376 100644
--- a/wp-admin/includes/class-language-pack-upgrader-skin.php
+++ b/wp-admin/includes/class-language-pack-upgrader-skin.php
@@ -52,11 +52,13 @@ class Language_Pack_Upgrader_Skin extends WP_Upgrader_Skin {
 	}
 
 	/**
-	 * @param string|WP_Error $error
+	 * @since 5.9.0 Renamed `$error` to `$errors` for PHP 8 named parameter support.
+	 *
+	 * @param string|WP_Error $errors Errors.
 	 */
-	public function error( $error ) {
+	public function error( $errors ) {
 		echo '<div class="lp-error">';
-		parent::error( $error );
+		parent::error( $errors );
 		echo '</div>';
 	}
 
diff --git a/wp-admin/includes/class-wp-upgrader-skin.php b/wp-admin/includes/class-wp-upgrader-skin.php
index 40053df1bc..bb7e7bbf3b 100644
--- a/wp-admin/includes/class-wp-upgrader-skin.php
+++ b/wp-admin/includes/class-wp-upgrader-skin.php
@@ -165,7 +165,7 @@ class WP_Upgrader_Skin {
 	/**
 	 * @since 2.8.0
 	 *
-	 * @param string|WP_Error $errors
+	 * @param string|WP_Error $errors Errors.
 	 */
 	public function error( $errors ) {
 		if ( ! $this->done_header ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8ed66486df..8797a28794 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51781';
+$wp_version = '5.9-alpha-51782';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.