diff --git a/system/configuration.nix b/system/configuration.nix
index e0bf560..c736659 100644
--- a/system/configuration.nix
+++ b/system/configuration.nix
@@ -66,6 +66,11 @@ in
   nix = {
     extraOptions = "experimental-features = nix-command flakes";
     package = pkgs.nixFlakes;
+    gc = {
+      automatic = true;
+      dates = "weekly";
+      options  = "--delete-older-than 30d";
+    };
   };
 
   services.xserver.enable = true;