diff --git a/wp-admin/includes/misc.php b/wp-admin/includes/misc.php
index c462f85a4b..45a065d754 100644
--- a/wp-admin/includes/misc.php
+++ b/wp-admin/includes/misc.php
@@ -1146,15 +1146,17 @@ function wp_admin_canonical_url() {
  * @since 4.9.0
  */
 function wp_admin_headers() {
-	$policy = 'same-origin';
+	$policy = 'strict-origin-when-cross-origin';
 
 	/**
-	 * Filters the admin referrer policy header value. Default 'same-origin'.
+	 * Filters the admin referrer policy header value.
 	 *
 	 * @since 4.9.0
+	 * @since 4.9.5 The default value was changed to 'strict-origin-when-cross-origin'.
+	 *
 	 * @link https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
 	 *
-	 * @param string $policy The referrer policy header value.
+	 * @param string $policy The admin referrer policy header value. Default 'strict-origin-when-cross-origin'.
 	 */
 	$policy = apply_filters( 'admin_referrer_policy', $policy );
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 4cf31c5f31..0f10c79805 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42829';
+$wp_version = '5.0-alpha-42830';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.