diff --git a/configuration/common/default.nix b/configuration/common/default.nix
index f2c0dca..8ee1230 100644
--- a/configuration/common/default.nix
+++ b/configuration/common/default.nix
@@ -38,6 +38,12 @@
   services.openssh.challengeResponseAuthentication = false;
   services.openssh.permitRootLogin = lib.mkDefault "no";
 
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
   services.nginx = {
     enableReload = true;
     recommendedGzipSettings = true;