diff --git a/lib/full-site-editing/page-templates.php b/lib/full-site-editing/page-templates.php
index 89ce31dba143f0..46ce5f37c64914 100644
--- a/lib/full-site-editing/page-templates.php
+++ b/lib/full-site-editing/page-templates.php
@@ -17,15 +17,9 @@ function gutenberg_load_block_page_templates( $templates, $theme, $post ) {
 	if ( ! gutenberg_is_fse_theme() ) {
 		return $templates;
 	}
-	$config_file = locate_template( 'experimental-theme.json' );
-	if ( ! file_exists( $config_file ) ) {
-		return $templates;
-	}
-	$data           = json_decode(
-		file_get_contents( $config_file ),
-		true
-	);
-	$page_templates = array();
+
+	$resolver       = WP_Theme_JSON_Resolver();
+	$page_templates = $resolver->get_theme_data()->get_page_templates();
 	if ( isset( $data['pageTemplates'] ) ) {
 		foreach ( $data['pageTemplates']  as $key => $page_template ) {
 			if ( ( ! isset( $page_template['postTypes'] ) && 'page' === $post->post_type ) ||