diff --git a/flake.nix b/flake.nix
index 966f01b..182e6dd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -222,8 +222,8 @@
             wantedBy    = [ "timers.target" ];
             partOf      = [ "${cfg.user}_new_users.service" ];
             timerConfig = {
-              # every hour
-              OnCalendar  = "*-*-* *:15:00";
+              # every 15 min
+              OnCalendar  = "*-*-* *:0/15:00";
               Unit        = "${cfg.user}_update.service";
             };
           };