diff --git a/hosts/desktop.nix b/hosts/desktop.nix
index 24e1071..8bf1818 100644
--- a/hosts/desktop.nix
+++ b/hosts/desktop.nix
@@ -46,20 +46,27 @@ with lib.my;
     neovim
   ];
 
-  nix.settings = {
-    connect-timeout = 5;
-    log-lines = 25;
-    min-free = 128000000;
-    max-free = 1000000000;
-    fallback = true;
-    auto-optimise-store = true;
-    substituters = [
-      "http://odyssey.mesh.vimium.net"
-      "https://cache.nixos.org"
-    ];
-    trusted-public-keys = [
-      "odyssey.mesh.vimium.net:ZhQhjscPWjoN4rlZwoMELznEiBnZ9O26iyGA27ibilQ="
-    ];
+  nix = {
+    settings = {
+      connect-timeout = 5;
+      log-lines = 25;
+      min-free = 128000000;
+      max-free = 1000000000;
+      fallback = true;
+      auto-optimise-store = true;
+      substituters = [
+        "http://odyssey.mesh.vimium.net"
+        "https://cache.nixos.org"
+      ];
+      trusted-public-keys = [
+        "odyssey.mesh.vimium.net:ZhQhjscPWjoN4rlZwoMELznEiBnZ9O26iyGA27ibilQ="
+      ];
+    };
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "-d --delete-older-than 7d";
+    };
   };
 
   modules.desktop.gnome.enable = true;
diff --git a/hosts/server.nix b/hosts/server.nix
index 054176c..c0a34a0 100644
--- a/hosts/server.nix
+++ b/hosts/server.nix
@@ -34,6 +34,17 @@ with lib.my;
     neovim
   ];
 
+  nix = {
+    settings = {
+      auto-optimise-store = true;
+    };
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options = "-d --delete-older-than 7d";
+    };
+  };
+
   modules.networking.tailscale = {
     enable = true;
     restrictSSH = false;