diff --git a/modules/common/nix.nix b/modules/common/nix.nix
index f1f6fd4..13de898 100644
--- a/modules/common/nix.nix
+++ b/modules/common/nix.nix
@@ -4,6 +4,12 @@
     experimental-features = ["nix-command" "flakes"];
   };
 
+  nix.gc = {
+    automatic = true ;
+    dates = "daily" ;
+    options = "--delete-older-than 7d" ;
+  };
+
   nixpkgs.config = {
     #    allowUnfree = true;
     #    allowUnsupportedSystem = true;