diff --git a/configuration.nix b/configuration.nix
index eb5e04d..632729d 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -160,4 +160,11 @@
 
   # flakes
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
+
+  # automatically collect garbage
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 60d";
+  };
 }