diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-admin/includes/theme.php
--- a/wp/wp-admin/includes/theme.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-admin/includes/theme.php	Fri Sep 05 18:52:52 2025 +0200
@@ -493,9 +493,6 @@
  *         for more information on the make-up of possible return objects depending on the value of `$action`.
  */
 function themes_api( $action, $args = array() ) {
-	// Include an unmodified $wp_version.
-	require ABSPATH . WPINC . '/version.php';
-
 	if ( is_array( $args ) ) {
 		$args = (object) $args;
 	}
@@ -511,7 +508,7 @@
 	}
 
 	if ( ! isset( $args->wp_version ) ) {
-		$args->wp_version = substr( $wp_version, 0, 3 ); // x.y
+		$args->wp_version = substr( wp_get_wp_version(), 0, 3 ); // x.y
 	}
 
 	/**
@@ -562,7 +559,7 @@
 
 		$http_args = array(
 			'timeout'    => 15,
-			'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
+			'user-agent' => 'WordPress/' . wp_get_wp_version() . '; ' . home_url( '/' ),
 		);
 		$request   = wp_remote_get( $url, $http_args );