diff --git a/configuration.nix b/configuration.nix
index 2400d09..545ac12 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -3,7 +3,7 @@ let
   secrets = import ./secrets.nix;
   hostname = "mail-dumpstack-io";
   domain = "dumpstack.io";
-  branch = "21.05";
+  branch = "21.11";
 in {
   imports = [
     ./hardware-configuration.nix