diff --git a/flake.nix b/flake.nix
index 80ad25c..626373f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,7 +33,7 @@
     };
 
     simple-nixos-mailserver = {
-      url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-21.11";
+      url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-22.05";
       inputs.nixpkgs.follows = "nixpkgs";
     };