diff --git a/os/common.nix b/os/common.nix
index a0c8884..0cf3b65 100644
--- a/os/common.nix
+++ b/os/common.nix
@@ -50,8 +50,14 @@
   };
 
   nix = {
+    gc = {
+      automatic = true;
+      persistent = true;
+      options = "--delete-older-than 14d";
+    };
     package = pkgs.lix;
     settings = {
+      auto-optimise-store = true;
       experimental-features = [
         "nix-command"
         "flakes"