diff --git a/modules/base.nix b/modules/base.nix
index b4e454d..d13d10f 100644
--- a/modules/base.nix
+++ b/modules/base.nix
@@ -5,4 +5,10 @@
     vim
     rsync
   ];
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
 }