diff --git a/nix/sources.json b/nix/sources.json
index 5b4377b..592071d 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -55,12 +55,12 @@
     },
     "nixos-mailserver": {
         "branch": "nixos-22.05",
-        "ref": "nixos-21.11",
+        "ref": "nixos-22.05",
         "repo": "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver",
-        "rev": "6e3a7b2ea6f0d68b82027b988aa25d3423787303",
-        "sha256": "1i56llz037x416bw698v8j6arvv622qc0vsycd20lx3yx8n77n44",
+        "rev": "f535d8123c4761b2ed8138f3d202ea710a334a1d",
+        "sha256": "0csx2i8p7gbis0n5aqpm57z5f9cd8n9yabq04bg1h4mkfcf7mpl6",
         "type": "tarball",
-        "url": "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/6e3a7b2ea6f0d68b82027b988aa25d3423787303.tar.gz",
+        "url": "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/f535d8123c4761b2ed8138f3d202ea710a334a1d.tar.gz",
         "url_template": "<repo>/-/archive/<rev>.tar.gz"
     },
     "nixpkgs": {