diff --git a/configuration.nix b/configuration.nix
index dc86b8b..181ad6f 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -16,8 +16,11 @@
 
   ## Boot
   # Bootloader.
-  boot.loader.grub.enable = true;
-  boot.loader.grub.device = "/dev/nvme0n1";
+  boot.loader.grub = {
+    enable = true;
+    device = "/dev/nvme0n1";
+    configurationLimit = 10;
+  };
 
   # Use latest kernel.
   boot.kernelPackages = pkgs.linuxPackages_latest;
@@ -54,6 +57,13 @@
     "nix-command"
     "flakes"
   ];
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 7d";
+  };
+
   # Allow unfree packages
   nixpkgs.config.allowUnfree = true;