diff --git a/wp-admin/update-core.php b/wp-admin/update-core.php
index 6e23d66866..a38e43c46f 100644
--- a/wp-admin/update-core.php
+++ b/wp-admin/update-core.php
@@ -154,7 +154,7 @@ function list_core_update( $update ) {
 	echo $message;
 	echo '</p>';
 
-	echo '<form method="post" action="' . $form_action . '" name="upgrade" class="upgrade">';
+	echo '<form method="post" action="' . esc_url( $form_action ) . '" name="upgrade" class="upgrade">';
 	wp_nonce_field( 'upgrade-core' );
 
 	echo '<p>';
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 20088aca95..e914caa0dd 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-51913';
+$wp_version = '5.9-alpha-51914';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.