diff --git a/wp-admin/includes/file.php b/wp-admin/includes/file.php
index edb3d99361..2e4493e8d8 100644
--- a/wp-admin/includes/file.php
+++ b/wp-admin/includes/file.php
@@ -1705,7 +1705,7 @@ function copy_dir( $from, $to, $skip_list = array() ) {
 	$to   = trailingslashit( $to );
 
 	foreach ( (array) $dirlist as $filename => $fileinfo ) {
-		if ( in_array( $filename, $skip_list ) ) {
+		if ( in_array( $filename, $skip_list, true ) ) {
 			continue;
 		}
 
diff --git a/wp-admin/includes/update-core.php b/wp-admin/includes/update-core.php
index 1cb915f858..8df6150356 100644
--- a/wp-admin/includes/update-core.php
+++ b/wp-admin/includes/update-core.php
@@ -1312,7 +1312,7 @@ function _copy_dir( $from, $to, $skip_list = array() ) {
 	$to   = trailingslashit( $to );
 
 	foreach ( (array) $dirlist as $filename => $fileinfo ) {
-		if ( in_array( $filename, $skip_list ) ) {
+		if ( in_array( $filename, $skip_list, true ) ) {
 			continue;
 		}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index b67caa424e..6ed152e8f0 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta2-46399';
+$wp_version = '5.3-beta2-46400';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.