diff --git a/common/pc/de.nix b/common/pc/de.nix
index a0bc7a0..cb642c6 100644
--- a/common/pc/de.nix
+++ b/common/pc/de.nix
@@ -49,7 +49,7 @@ in {
     services.printing.enable = true;
 
     # Security
-    services.gnome3.gnome-keyring.enable = true;
+    services.gnome.gnome-keyring.enable = true;
     security.pam.services.googlebot.enableGnomeKeyring = true;
   };
 }
diff --git a/flake.lock b/flake.lock
index d64617f..65b4d5c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1620340338,
-        "narHash": "sha256-Op/4K0+Z9Sp5jtFH0s/zMM4H7VFZxrekcAmjQ6JpQ4w=",
+        "lastModified": 1622622179,
+        "narHash": "sha256-XCw/9QDuj9J6prVR8YrteTcFKj2sRWYIjwgs8qOOrYQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "63586475587d7e0e078291ad4b49b6f6a6885100",
+        "rev": "eaba7870ffc3400eca4407baa24184b7fe337ec1",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-unstable",
+        "ref": "nixos-21.05",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -43,16 +43,16 @@
         "utils": "utils"
       },
       "locked": {
-        "lastModified": 1619850087,
-        "narHash": "sha256-UVVge/7R/4afO+hp+T6MOiZJjMH8LS3VNXEWiRIRPcA=",
+        "lastModified": 1622448045,
+        "narHash": "sha256-duIjiaBwdkY+JpeVbQSt0SOrYQ4GDH5XoT3xZOz4jPA=",
         "owner": "simple-nixos-mailserver",
         "repo": "nixos-mailserver",
-        "rev": "8b287056215cac91438a671054e7eb2c932ab21a",
+        "rev": "6e0690093c24261192ee5c0557f85791a67eec29",
         "type": "gitlab"
       },
       "original": {
         "owner": "simple-nixos-mailserver",
-        "ref": "master",
+        "ref": "nixos-21.05",
         "repo": "nixos-mailserver",
         "type": "gitlab"
       }
diff --git a/flake.nix b/flake.nix
index 275fcc4..bdd84b0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,7 +1,7 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/master";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05";
+    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-21.05";
   };
 
   outputs = { self, nixpkgs, simple-nixos-mailserver }: {