diff --git a/system/configuration.nix b/system/configuration.nix
index 7ea7634..d389713 100644
--- a/system/configuration.nix
+++ b/system/configuration.nix
@@ -137,6 +137,11 @@
 
   nix.registry.nixpkgs.flake = inputs.nixpkgs;
   nix = {
+    gc = {
+      automatic = true;
+      dates = "daily";
+      options = "--delete-older-than 3d";
+    };
     settings = {
       auto-optimise-store = true;
       substituters = [