diff --git a/readme.txt b/readme.txt
index 23438907800..85b88076940 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Donate link: https://yoa.st/1up
 License: GPLv3
 License URI: http://www.gnu.org/licenses/gpl.html
 Tags: SEO, XML sitemap, Content analysis, Readability, Schema
-Tested up to: 6.3
+Tested up to: 6.4
 Stable tag: 21.4
 Requires PHP: 7.2.5
 
diff --git a/tests/unit/bootstrap.php b/tests/unit/bootstrap.php
index 4538a077a9d..4fc6bfb17b0 100644
--- a/tests/unit/bootstrap.php
+++ b/tests/unit/bootstrap.php
@@ -36,7 +36,7 @@
 define( 'YOAST_VENDOR_PREFIX_DIRECTORY', 'vendor_prefixed' );
 
 define( 'YOAST_SEO_PHP_REQUIRED', '7.2.5' );
-define( 'YOAST_SEO_WP_TESTED', '6.3.2' );
+define( 'YOAST_SEO_WP_TESTED', '6.4' );
 define( 'YOAST_SEO_WP_REQUIRED', '6.2' );
 
 if ( ! defined( 'WPSEO_NAMESPACES' ) ) {
diff --git a/wp-seo-main.php b/wp-seo-main.php
index 7b58f3505fd..87f6f3781fc 100644
--- a/wp-seo-main.php
+++ b/wp-seo-main.php
@@ -35,7 +35,7 @@
 define( 'YOAST_VENDOR_PREFIX_DIRECTORY', 'vendor_prefixed' );
 
 define( 'YOAST_SEO_PHP_REQUIRED', '7.2.5' );
-define( 'YOAST_SEO_WP_TESTED', '6.3.2' );
+define( 'YOAST_SEO_WP_TESTED', '6.4' );
 define( 'YOAST_SEO_WP_REQUIRED', '6.2' );
 
 if ( ! defined( 'WPSEO_NAMESPACES' ) ) {