diff --git a/users/alice/home.nix b/users/alice/home.nix
index 6502869..56bc27e 100644
--- a/users/alice/home.nix
+++ b/users/alice/home.nix
@@ -165,5 +165,11 @@
     secrets."alice/wakatime-api-key".path = "/home/alice/.config/doom/wakatime";
   };
 
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
   home.stateVersion = "23.11";
 }