diff --git a/wp-admin/install.php b/wp-admin/install.php
index 34d5d4c7f7..e81331acfc 100644
--- a/wp-admin/install.php
+++ b/wp-admin/install.php
@@ -67,7 +67,7 @@ function display_header( $body_classes = '' ) {
 <!DOCTYPE html>
 <html <?php language_attributes(); ?>>
 <head>
-	<meta name="viewport" content="width=device-width" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<meta name="robots" content="noindex,nofollow" />
 	<title><?php _e( 'WordPress &rsaquo; Installation' ); ?></title>
diff --git a/wp-admin/maint/repair.php b/wp-admin/maint/repair.php
index 1c0f6ffa98..2104ccd3ab 100644
--- a/wp-admin/maint/repair.php
+++ b/wp-admin/maint/repair.php
@@ -14,7 +14,7 @@ header( 'Content-Type: text/html; charset=utf-8' );
 <!DOCTYPE html>
 <html <?php language_attributes(); ?>>
 <head>
-	<meta name="viewport" content="width=device-width" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<meta name="robots" content="noindex,nofollow" />
 	<title><?php _e( 'WordPress &rsaquo; Database Repair' ); ?></title>
diff --git a/wp-admin/setup-config.php b/wp-admin/setup-config.php
index b394de8679..2d1ff715d3 100644
--- a/wp-admin/setup-config.php
+++ b/wp-admin/setup-config.php
@@ -105,7 +105,7 @@ function setup_config_display_header( $body_classes = array() ) {
 <!DOCTYPE html>
 <html<?php echo $dir_attr; ?>>
 <head>
-	<meta name="viewport" content="width=device-width" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 	<meta name="robots" content="noindex,nofollow" />
 	<title><?php _e( 'WordPress &rsaquo; Setup Configuration File' ); ?></title>
diff --git a/wp-admin/upgrade.php b/wp-admin/upgrade.php
index 414fbb28d1..9edadd9be2 100644
--- a/wp-admin/upgrade.php
+++ b/wp-admin/upgrade.php
@@ -59,7 +59,7 @@ header( 'Content-Type: ' . get_option( 'html_type' ) . '; charset=' . get_option
 <!DOCTYPE html>
 <html <?php language_attributes(); ?>>
 <head>
-	<meta name="viewport" content="width=device-width" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
 	<meta http-equiv="Content-Type" content="<?php bloginfo( 'html_type' ); ?>; charset=<?php echo get_option( 'blog_charset' ); ?>" />
 	<meta name="robots" content="noindex,nofollow" />
 	<title><?php _e( 'WordPress &rsaquo; Update' ); ?></title>
diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 0619f44f30..67544bc889 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -3868,7 +3868,7 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 <html <?php echo $dir_attr; ?>>
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=<?php echo $parsed_args['charset']; ?>" />
-	<meta name="viewport" content="width=device-width">
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
 		<?php
 		if ( function_exists( 'wp_robots' ) && function_exists( 'wp_robots_no_robots' ) && function_exists( 'add_filter' ) ) {
 			add_filter( 'wp_robots', 'wp_robots_no_robots' );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 8f346a3dc8..5494204799 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-59026';
+$wp_version = '6.7-alpha-59027';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
diff --git a/wp-login.php b/wp-login.php
index 45d7794c84..a489d98856 100644
--- a/wp-login.php
+++ b/wp-login.php
@@ -462,7 +462,7 @@ function wp_shake_js() {
  */
 function wp_login_viewport_meta() {
 	?>
-	<meta name="viewport" content="width=device-width" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
 	<?php
 }
 
