diff --git a/mkosi.bump b/mkosi.bump
index d3510a43..65a9ae7e 100755
--- a/mkosi.bump
+++ b/mkosi.bump
@@ -2,4 +2,4 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 set -e
 
-date +%Y%m%d%H%M%S
+date -u +%Y%m%d%H%M%S