diff --git a/nix/hosts/cc-ci-orchestrator-hetzner/configuration.nix b/nix/hosts/cc-ci-orchestrator-hetzner/configuration.nix
index 0e007c4..fd14b5e 100644
--- a/nix/hosts/cc-ci-orchestrator-hetzner/configuration.nix
+++ b/nix/hosts/cc-ci-orchestrator-hetzner/configuration.nix
@@ -212,10 +212,11 @@ SSHCFG
   };
 
   systemd.timers.cc-ci-upgrade-all = {
-    description = "Weekly trigger for cc-ci-upgrade-all (Thursdays 22:00 UTC)";
+    description = "Weekly trigger for cc-ci-upgrade-all (Thursdays 22:00 America/New_York — Boston 10pm)";
     wantedBy = [ "timers.target" ];
     timerConfig = {
-      OnCalendar = "Thu *-*-* 22:00:00 UTC";
+      # 10pm Thursday Boston time — DST-aware (EDT→02:00 UTC, EST→03:00 UTC) via the tz in OnCalendar.
+      OnCalendar = "Thu *-*-* 22:00:00 America/New_York";
       Persistent = true;  # if the box was down at the scheduled time, run once on next boot
     };
   };