diff --git a/flake.lock b/flake.lock
index e513dfb..7593ec2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -88,21 +88,6 @@
         "type": "indirect"
       }
     },
-    "nixpkgs-21_05": {
-      "locked": {
-        "lastModified": 1625692408,
-        "narHash": "sha256-e9L3TLLDVIJpMnHtiNHJE62oOh6emRtSZ244bgYJUZs=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "c06613c25df3fe1dd26243847a3c105cf6770627",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "nixos-21.05",
-        "type": "indirect"
-      }
-    },
     "nixpkgs-unstable": {
       "locked": {
         "lastModified": 1656835607,
@@ -134,23 +119,22 @@
         "nixpkgs": [
           "nixpkgs-unstable"
         ],
-        "nixpkgs-21_05": "nixpkgs-21_05",
-        "nixpkgs-21_11": [
+        "nixpkgs-22_05": [
           "nixpkgs"
         ],
         "utils": "utils"
       },
       "locked": {
-        "lastModified": 1638911354,
-        "narHash": "sha256-hNhzLOp+dApEY15vwLAQZu+sjEQbJcOXCaSfAT6lpsQ=",
+        "lastModified": 1655930346,
+        "narHash": "sha256-ht56HHOzEhjeIgAv5ZNFjSVX/in1YlUs0HG9c1EUXTM=",
         "owner": "simple-nixos-mailserver",
         "repo": "nixos-mailserver",
-        "rev": "6e3a7b2ea6f0d68b82027b988aa25d3423787303",
+        "rev": "f535d8123c4761b2ed8138f3d202ea710a334a1d",
         "type": "gitlab"
       },
       "original": {
         "owner": "simple-nixos-mailserver",
-        "ref": "nixos-21.11",
+        "ref": "nixos-22.05",
         "repo": "nixos-mailserver",
         "type": "gitlab"
       }