diff --git a/baseconfiguration.nix b/baseconfiguration.nix
index f848887..06f1b1c 100644
--- a/baseconfiguration.nix
+++ b/baseconfiguration.nix
@@ -39,6 +39,17 @@
     extraOptions = ''
     experimental-features = nix-command flakes
     '';
+    gc = {
+      automatic = true;
+      persistent = true;
+      dates = "weekly";
+      options = "--delete-older-than 30d";
+    };
+    # Free up to 50GiB whenever there is less than 10GiB left.
+    extraOptions = ''
+      min-free = ${toString (10 * 1024 * 1024 * 1024)}
+      max-free = ${toString (50 * 1024 * 1024 * 1024)}
+    '';
   };
 
   nixpkgs = {