diff --git a/modules/nix-config/default.nix b/modules/nix-config/default.nix
index 3823e9e..480eed2 100644
--- a/modules/nix-config/default.nix
+++ b/modules/nix-config/default.nix
@@ -47,12 +47,14 @@ in {
       flake-registry = ${
         pkgs.writeText "null-registry.json" ''{"flakes":[],"version":2}''
       }
+      max-free = ${toString (8 * 1024*1024*1024)}
+      min-free = ${toString (4 * 1024*1024*1024)}
     '';
 
     gc = {
       automatic = true;
       dates = "weekly";
-      options = "--delete-older-than 30d";
+      options = "--delete-older-than 5d --max-freed 16G";
     };
 
     distributedBuilds = true;