Ticket #36975: 36975.diff

src/wp-admin/network/upgrade.php

@@ -69 +69 @@
 
                         echo "<li>$siteurl</li>";
 
-                        $response = wp_remote_get( $upgrade_url, array( 'timeout' => 120, 'httpversion' => '1.1' ) );
+                        $response = wp_remote_get( $upgrade_url, array(
+                                'timeout'     => 120,
+                                'httpversion' => '1.1',
+                                'sslverify'   => false,
+                        ) );
                         if ( is_wp_error( $response ) ) {
                                 wp_die( sprintf(
                                         /* translators: 1: site url, 2: server error message */