diff --git a/base.nix b/base.nix
index 9ce71b3..5b09799 100644
--- a/base.nix
+++ b/base.nix
@@ -37,6 +37,12 @@
     builders-use-substitutes = true;
   };
 
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 7d";
+  };
+
   services.keyd = {
     enable = true;
     keyboards = {