diff --git src/wp-admin/includes/dashboard.php src/wp-admin/includes/dashboard.php
index 7ebbe5fa41..8c5daef7dd 100644
--- src/wp-admin/includes/dashboard.php
+++ src/wp-admin/includes/dashboard.php
@@ -982,20 +982,6 @@ function wp_dashboard_cached_rss_widget( $widget_id, $callback, $check_urls = ar
 
 	$locale = get_locale();
 	$cache_key = 'dash_' . md5( $widget_id . '_' . $locale );
-
-	/*
-	 * Clear the cached 4.7 w.org feed markup during the upgrade to 4.8.0.
-	 *
-	 * This wasn't done in wp-admin/includes/upgrade.php because that would
-	 * trigger an upgrade screen for users, and it's not worth the UX cost
-	 * for such a small change.
-	 *
-	 * @todo This is a temporary hack for 4.8.0 only, and should be removed in 4.8.1.
-	 */
-	if ( 'dashboard_primary' === $widget_id && false !== strpos( get_transient( $cache_key ), 'rssSummary' ) ) {
-		delete_transient( $cache_key );
-	}
-
 	if ( false !== ( $output = get_transient( $cache_key ) ) ) {
 		echo $output;
 		return true;