Index: wp-admin/css/about.css
===================================================================
--- wp-admin/css/about.css	(revision 32727)
+++ wp-admin/css/about.css	(working copy)
@@ -23,7 +23,9 @@
 }
 
 .about-wrap div.updated,
-.about-wrap div.error {
+.about-wrap div.error,
+.about-wrap .notice-warning,
+.about-wrap .notice-info {
 	display: none !important;
 }